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Jin L, Richardson A, Lynch J, Lorkiewicz P, Srivastava S, Fryar L, Miller A, Theis W, Shirk G, Bhatnagar A, Srivastava S, Riggs DW, Conklin DJ. Formaldehyde and the transient receptor potential ankyrin-1 contribute to electronic cigarette aerosol-induced endothelial dysfunction in mice. Toxicol Sci 2024; 201:331-347. [PMID: 39067042 PMCID: PMC11424888 DOI: 10.1093/toxsci/kfae096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024] Open
Abstract
Electronic nicotine delivery systems (ENDS) aerosol exposures can induce endothelial dysfunction (ED) in healthy young humans and animals. Thermal degradation of ENDS solvents, propylene glycol, and vegetable glycerin (PG: VG), generates abundant formaldehyde (FA) and other carbonyls. Because FA can activate the transient receptor potential ankyrin-1 (TRPA1) sensor, we hypothesized that FA in ENDS aerosols provokes TRPA1-mediated changes that include ED and "respiratory braking"-biomarkers of harm. To test this, wild-type (WT) and TRPA1-null mice were exposed by inhalation to either filtered air, PG: VG-derived aerosol, or FA (5 ppm). Short-term exposures to PG: VG and FA-induced ED in female WT but not in female TRPA1-null mice. Moreover, acute exposures to PG: VG and FA stimulated respiratory braking in WT but not in TRPA1-null female mice. Urinary metabolites of FA (ie, N-1,3-thiazolidine-4-carboxylic acid, TCA; N-1,3-thiazolidine-4-carbonyl glycine, TCG) and monoamines were measured by LC-MS/MS. PG: VG and FA exposures significantly increased urinary excretion of both TCA and TCG in both WT and TRPA1-null mice. To confirm that inhaled FA directly contributed to urinary TCA, mice were exposed to isotopic 13C-FA gas (1 ppm, 6 h). 13C-FA exposure significantly increased the urine level of 13C-TCA in the early collection (0 to 3 h) supporting a direct relationship between inhaled FA and TCA. Collectively, these data suggest that ENDS use may increase CVD risk dependent on FA, TRPA1, and catecholamines, yet independently of either nicotine or flavorants. This study supports that levels of FA in ENDS-derived aerosols should be lowered to mitigate CVD risk in people who use ENDS.
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Affiliation(s)
- Lexiao Jin
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
| | - Andre Richardson
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
| | - Jordan Lynch
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
| | - Pawel Lorkiewicz
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
- Division of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, KY 40202, United States
- Superfund Research Center, University of Louisville, Louisville, KY 40202, United States
| | - Shweta Srivastava
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
- Superfund Research Center, University of Louisville, Louisville, KY 40202, United States
| | - Laura Fryar
- School of Medicine, University of Louisville, Louisville, KY 40202, United States
| | - Alexis Miller
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
| | - Whitney Theis
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
| | - Gregg Shirk
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
| | - Aruni Bhatnagar
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
- Division of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, KY 40202, United States
- Superfund Research Center, University of Louisville, Louisville, KY 40202, United States
| | - Sanjay Srivastava
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
- Division of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, KY 40202, United States
- Superfund Research Center, University of Louisville, Louisville, KY 40202, United States
| | - Daniel W Riggs
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
- Division of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, KY 40202, United States
- Superfund Research Center, University of Louisville, Louisville, KY 40202, United States
| | - Daniel J Conklin
- American Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, KY 40202, United States
- Christina Lee Brown Envirome Institute, University of Louisville, Louisville, KY 40202, United States
- Division of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, KY 40202, United States
- Superfund Research Center, University of Louisville, Louisville, KY 40202, United States
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Søgaard R, Poulsen PB, Gelardi RM, Geschke S, Schwensen JFB, Johansen JD. Hidden formaldehyde in cosmetic products. Contact Dermatitis 2024. [PMID: 39155513 DOI: 10.1111/cod.14669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 07/23/2024] [Accepted: 07/25/2024] [Indexed: 08/20/2024]
Abstract
BACKGROUND Formaldehyde is a common cause of contact allergy. Hidden formaldehyde, that is, formaldehyde in products without formaldehyde releasers, has previously been detected in cosmetic products. OBJECTIVES The objective of this study was to investigate the content and causes of hidden formaldehyde in leave-on cosmetic products. METHODS The formaldehyde release from 142 cosmetic products, primarily creams, was analysed using the chromotropic acid (CA) method. The study included 130 products with no formaldehyde releasers on the ingredient list and 12 products with formaldehyde releasers. Products without formaldehyde releasers positive to CA, that is, with formaldehyde ≥2.5 ppm, were additionally analysed using high-performance liquid chromatography (HPLC). Formaldehyde release from selected raw materials and packaging were also investigated. RESULTS Hidden formaldehyde was found in 23 of the 130 products (18%) without formaldehyde releasers on the ingredient list. The average formaldehyde content was 105 ppm (range: 0.5-507 ppm) in products with hidden formaldehyde and 355 ppm (range: 75-637 ppm) in eight products with formaldehyde releasers, selected for HPLC analysis. Impurities of formaldehyde in dihydroxyacetone may be a cause of hidden formaldehyde in self-tanners. No clear pattern was found for the other products with hidden formaldehyde. CONCLUSIONS Changes in regulation are needed to prevent allergic contact dermatitis from hidden formaldehyde in cosmetic products.
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Affiliation(s)
- Rebekka Søgaard
- The National Allergy Research Centre, Department of Allergy, Dermatology and Venerology, Copenhagen University Hospital Herlev-Gentofte, Gentofte Hospital, Hellerup, Denmark
| | | | | | | | - Jakob Ferløv Baselius Schwensen
- The National Allergy Research Centre, Department of Allergy, Dermatology and Venerology, Copenhagen University Hospital Herlev-Gentofte, Gentofte Hospital, Hellerup, Denmark
| | - Jeanne Duus Johansen
- The National Allergy Research Centre, Department of Allergy, Dermatology and Venerology, Copenhagen University Hospital Herlev-Gentofte, Gentofte Hospital, Hellerup, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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Heywood J, Abele G, Langenbach B, Litvin S, Smallets S, Paustenbach D. Composition of e-cigarette aerosols: A review and risk assessment of selected compounds. J Appl Toxicol 2024. [PMID: 39147402 DOI: 10.1002/jat.4683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Revised: 07/22/2024] [Accepted: 07/26/2024] [Indexed: 08/17/2024]
Abstract
The potential harms and benefits of e-cigarettes, or electronic nicotine delivery systems (ENDS), have received significant attention from public health and regulatory communities. Such products may provide a reduced risk means of nicotine delivery for combustible cigarette smokers while being inappropriately appealing to nicotine naive youth. Numerous authors have examined the chemical complexity of aerosols from various open- and closed-system ENDS. This body of literature is reviewed here, with the risks of ENDS aerosol exposure among users evaluated with a margin of exposure (MoE) approach for two non-carcinogens (methylglyoxal, butyraldehyde) and a cancer risk analysis for the carcinogen N-nitrosonornicotine (NNN). We identified 96 relevant papers, including 17, 13, and 5 reporting data for methylglyoxal, butyraldehyde, and NNN, respectively. Using low-end (minimum aerosol concentration, low ENDS use) and high-end (maximum aerosol concentration, high ENDS use) assumptions, estimated doses for methylglyoxal (1.78 × 10-3-135 μg/kg-bw/day) and butyraldehyde (1.9 × 10-4-66.54 μg/kg-bw/day) corresponded to MoEs of 227-17,200,000 and 271-280,000,000, respectively, using identified points of departure (PoDs). Doses of 9.90 × 10-6-1.99 × 10-4 μg/kg-bw/day NNN corresponded to 1.4-28 surplus cancers per 100,000 ENDS users, relative to a NNN-attributable surplus of 7440 per 100,000 cigarette smokers. It was concluded that methylglyoxal and butyraldehyde in ENDS aerosols, while not innocuous, did not present a significant risk of irritant effects among ENDS users. The carcinogenic risks of NNN in ENDS aerosols were reduced, but not eliminated, relative to concentrations reported in combustible cigarette smoke.
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Affiliation(s)
- Jonathan Heywood
- Paustenbach and Associates, Denver, Colorado, USA
- Insight Exposure & Risk Sciences Group, Boulder, Colorado, USA
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Muthumalage T, Noel A, Thanavala Y, Alcheva A, Rahman I. Challenges in current inhalable tobacco toxicity assessment models: A narrative review. Tob Induc Dis 2024; 22:TID-22-102. [PMID: 38860150 PMCID: PMC11163881 DOI: 10.18332/tid/188197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 04/17/2024] [Accepted: 05/01/2024] [Indexed: 06/12/2024] Open
Abstract
Emerging tobacco products such as electronic nicotine delivery systems (ENDS) and heated tobacco products (HTPs) have a dynamic landscape and are becoming widely popular as they claim to offer a low-risk alternative to conventional smoking. Most pre-clinical laboratories currently exploit in vitro, ex vivo, and in vivo experimental models to assess toxicological outcomes as well as to develop risk-estimation models. While most laboratories have produced a wide range of cell culture and mouse model data utilizing current smoke/aerosol generators and standardized puffing profiles, much variation still exists between research studies, hindering the generation of usable data appropriate for the standardization of these tobacco products. In this review, we discuss current state-of-the-art in vitro and in vivo models and their challenges, as well as insights into risk estimation of novel products and recommendations for toxicological parameters for reporting, allowing comparability of the research studies between laboratories, resulting in usable data for regulation of these products before approval by regulatory authorities.
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Affiliation(s)
| | - Alexandra Noel
- School of Veterinary Medicine Louisiana State University, Baton Rouge, United States
| | - Yasmin Thanavala
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, United States
| | - Aleksandra Alcheva
- Division of Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, United States
- Masonic Cancer Center, University of Minnesota, Minneapolis, United States
| | - Irfan Rahman
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, United States
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5
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Cox A, Brown KC, Bender C, Valentovic MA. The e-liquid flavoring cinnamaldehyde induces cellular stress responses in human proximal tubule (HK-2) kidney cells. Biomed Pharmacother 2024; 175:116666. [PMID: 38677246 PMCID: PMC11293278 DOI: 10.1016/j.biopha.2024.116666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 04/22/2024] [Accepted: 04/24/2024] [Indexed: 04/29/2024] Open
Abstract
Flavored e-liquid use has become popular among e-cigarette users recently, but the effects of such products outside the lung are not well characterized. In this work, acute exposure to the popular flavoring cinnamaldehyde (CIN) was performed on human proximal tubule (HK-2) kidney cells. Cells were exposed to 0-100 µM CIN for 24-48 h and cellular stress responses were assessed. Mitochondrial viability via MTT assay was significantly decreased at 20 µM for 24 and 48 h exposure. Seahorse XFp analysis showed significantly decreased mitochondrial energy output at 20 µM by 24 h exposure, in addition to significantly reduced ATP Synthase expression. Seahorse analysis also revealed significantly decreased glycolytic function at 20 µM by 24 h exposure, suggesting inability of glycolytic processes to compensate for reduced mitochondrial energy output. Cleaved caspase-3 expression, a mediator of apoptosis, was significantly increased at the 24 h mark. C/EBP homologous protein (CHOP) expression, a mediator of ER-induced apoptosis, was induced by 48 h and subsequently lost at the highest concentration of 100 µM. This decrease was accompanied by a simultaneous decrease in its downstream target cleaved caspase-3 at the 48 h mark. The autophagy marker microtubule-associated protein 1 A/1B light chain 3 (LC3B-I and LC3B-II) expression was significantly increased at 100 µM by 24 h. Autophagy-related 7 (ATG7) protein and mitophagy-related proteins PTEN-induced putative kinase 1 (PINK1) and PARKIN expression were significantly reduced at 24 and 48 h exposure. These results indicate acute exposure to CIN in the kidney HK-2 model induces mitochondrial dysfunction and cellular stress responses.
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Affiliation(s)
- Ashley Cox
- Department of Biomedical Sciences, Toxicology Research Cluster, Marshall University Joan C. Edwards School of Medicine, Huntington, WV 25701, United States
| | - Kathleen C Brown
- Department of Biomedical Sciences, Toxicology Research Cluster, Marshall University Joan C. Edwards School of Medicine, Huntington, WV 25701, United States
| | - Christopher Bender
- Department of Biomedical Sciences, Toxicology Research Cluster, Marshall University Joan C. Edwards School of Medicine, Huntington, WV 25701, United States
| | - Monica A Valentovic
- Department of Biomedical Sciences, Toxicology Research Cluster, Marshall University Joan C. Edwards School of Medicine, Huntington, WV 25701, United States.
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Chew RP, Kwan Joo Ern K, Muhammed J, Zamli AH. Evaluation of Dry Eye Parameters Among Electronic Cigarette Smokers. Cureus 2024; 16:e62148. [PMID: 38993422 PMCID: PMC11238759 DOI: 10.7759/cureus.62148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/11/2024] [Indexed: 07/13/2024] Open
Abstract
Introduction The emergence of electronic cigarettes as the "healthier" version of smoking has been popular, especially among young adults. However, knowledge about the potential effects of e-cigarettes on ocular structures is scarce. Objective To compare the mean change in dry eye parameters between e-cigarette smokers and non-smokers and to correlate between dry eye parameters with device power output. Methodology A cross-sectional, single-visit study was conducted involving 85 e-cigarette smokers and 85 non-smokers. All participants were evaluated on dry eye parameters, including the Ocular Surface Disease Index (OSDI) score, tear meniscus height (TMH), tear break-up time (TBUT), cornea fluorescein staining, and Schirmer's I test. The mean change in dry eye parameters was compared between e-cigarette smokers and non-smokers. The correlation between dry eye parameters with device power output was analyzed. Results Specifically, 32.94% of e-cigarette smokers were found to have a TMH <0.2 mm, compared to only 5.88% of non-smokers (p<0.001). A significant change in mean TBUT was found between the e-cigarette smokers (10.41+2.65 seconds) and non-smokers (12.66+3.14 seconds, p<0.001). The lower mean Schirmer's I test was found among e-cigarette smokers (12.75+7.24 mm, p<0.001). No significant change in the median OSDI score and corneal fluorescein staining. The OSDI score and device power output were found to have a significant positive correlation (p=0.003). There was a significant association between dry eye signs and device power output, including TMH (p=0.047), TBUT (p=0.002), Schirmer's I test (p<0.001), and corneal fluorescein staining (p<0.001). Conclusion Electronic cigarette smokers are prone to develop dry eyes. Concern should be raised on the risk of electronic cigarette use on ocular health, and regulation on e-cigarette ban should be revisited.
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Affiliation(s)
- Rui Ping Chew
- Department of Ophthalmology and Visual Science, School of Medical Sciences, Universiti Sains Malaysia, Kota Bharu, MYS
| | - Kevin Kwan Joo Ern
- Department of Ophthalmology and Visual Science, School of Medical Sciences, Universiti Sains Malaysia, Kota Bharu, MYS
| | - Julieana Muhammed
- Department of Ophthalmology and Visual Science, School of Medical Sciences, Universiti Sains Malaysia, Kota Bharu, MYS
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Kishimoto A, Wu D, O'Shea DF. Forecasting vaping health risks through neural network model prediction of flavour pyrolysis reactions. Sci Rep 2024; 14:9591. [PMID: 38719814 PMCID: PMC11079048 DOI: 10.1038/s41598-024-59619-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 04/11/2024] [Indexed: 05/12/2024] Open
Abstract
Vaping involves the heating of chemical solutions (e-liquids) to high temperatures prior to lung inhalation. A risk exists that these chemicals undergo thermal decomposition to new chemical entities, the composition and health implications of which are largely unknown. To address this concern, a graph-convolutional neural network (NN) model was used to predict pyrolysis reactivity of 180 e-liquid chemical flavours. The output of this supervised machine learning approach was a dataset of probability ranked pyrolysis transformations and their associated 7307 products. To refine this dataset, the molecular weight of each NN predicted product was automatically correlated with experimental mass spectrometry (MS) fragmentation data for each flavour chemical. This blending of deep learning methods with experimental MS data identified 1169 molecular weight matches that prioritized these compounds for further analysis. The average number of discrete matches per flavour between NN predictions and MS fragmentation was 6.4 with 92.8% of flavours having at least one match. Globally harmonized system classifications for NN/MS matches were extracted from PubChem, revealing that 127 acute toxic, 153 health hazard and 225 irritant classifications were predicted. This approach may reveal the longer-term health risks of vaping in advance of clinical diseases emerging in the general population.
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Affiliation(s)
| | - Dan Wu
- Department of Chemistry, Royal College of Surgeons in Ireland (RCSI), Dublin 2, Ireland.
| | - Donal F O'Shea
- Department of Chemistry, Royal College of Surgeons in Ireland (RCSI), Dublin 2, Ireland.
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Chu M, Wang R, Jing X, Li D, Fu G, Deng J, Xu Z, Zhao J, Liu Z, Fan Q, Pei L, Zeng Z, Liu C, Chen Z, Lu J, Liu XA. Conventional and multi-omics assessments of subacute inhalation toxicity due to propylene glycol and vegetable glycerin aerosol produced by electronic cigarettes. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 271:116002. [PMID: 38277972 DOI: 10.1016/j.ecoenv.2024.116002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 01/09/2024] [Accepted: 01/18/2024] [Indexed: 01/28/2024]
Abstract
Propylene glycol (PG) and vegetable glycerin (VG) are the most common solvents used in electronic cigarette liquids. No long-term inhalation toxicity assessments have been performed combining conventional and multi-omics approaches on the potential respiratory effects of the solvents in vivo. In this study, the systemic toxicity of aerosol generated from a ceramic heating coil-based e-cigarette was evaluated. First, the aerosol properties were characterized, including carbonyl emissions, the particle size distribution, and aerosol temperatures. To determine toxicological effects, rats were exposed, through their nose only, to filtered air or a propylene glycol (PG)/ glycerin (VG) (50:50, %W/W) aerosol mixture at the target concentration of 3 mg/L for six hours daily over a continuous 28-day period. Compared with the air group, female rats in the PG/VG group exhibited significantly lower body weights during both the exposure period and recovery period, and this was linked to a reduced food intake. Male rats in the PG/VG group also experienced a significant decline in body weight during the exposure period. Importantly, rats exposed to the PG/VG aerosol showed only minimal biological effects compared to those with only air exposure, with no signs of toxicity. Moreover, the transcriptomic, proteomic, and metabolomic analyses of the rat lung tissues following aerosol exposure revealed a series of candidate pathways linking aerosol inhalation to altered lung functions, especially the inflammatory response and disease. Dysregulated pathways of arachidonic acids, the neuroactive ligand-receptor interaction, and the hematopoietic cell lineage were revealed through integrated multi-omics analysis. Therefore, our integrated multi-omics approach offers novel systemic insights and early evidence of environmental-related health hazards associated with an e-cigarette aerosol using two carrier solvents in a rat model.
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Affiliation(s)
- Ming Chu
- Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, CAS Key Laboratory of Brain Connectome and Manipulation, Brain Cognition and Brain Disease Institute (BCBDI), Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen 518055, China; Laboratory of Life and Health Sciences, Shenzhen First union Technology Co., Ltd, Shenzhen 518103, China
| | - Ruoxi Wang
- Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, CAS Key Laboratory of Brain Connectome and Manipulation, Brain Cognition and Brain Disease Institute (BCBDI), Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen 518055, China
| | - Xiaoyuan Jing
- Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, CAS Key Laboratory of Brain Connectome and Manipulation, Brain Cognition and Brain Disease Institute (BCBDI), Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen 518055, China
| | - Ding Li
- Laboratory of Life and Health Sciences, Shenzhen First union Technology Co., Ltd, Shenzhen 518103, China; Laboratory of Life and Health Sciences, Shenzhen Health Union Biotechnology Co., Ltd, Shenzhen 518103, China
| | - Guofeng Fu
- Laboratory of Life and Health Sciences, Shenzhen First union Technology Co., Ltd, Shenzhen 518103, China
| | - Jingjing Deng
- Laboratory of Life and Health Sciences, Shenzhen Health Union Biotechnology Co., Ltd, Shenzhen 518103, China
| | - Zhibin Xu
- Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, CAS Key Laboratory of Brain Connectome and Manipulation, Brain Cognition and Brain Disease Institute (BCBDI), Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen 518055, China
| | - Jing Zhao
- Laboratory of Life and Health Sciences, Shenzhen Health Union Biotechnology Co., Ltd, Shenzhen 518103, China
| | - Zhang Liu
- Laboratory of Life and Health Sciences, Shenzhen Health Union Biotechnology Co., Ltd, Shenzhen 518103, China
| | - Qiming Fan
- Guangdong Zhongke EnHealth Science and Technology Co., Ltd. Foshan 528000, China
| | - Lanjie Pei
- Hubei Provincial Key Laboratory for Applied Toxicology, Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, China
| | - Zhi Zeng
- Department of Pathology, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, China
| | - Chuan Liu
- Laboratory of Life and Health Sciences, Shenzhen First union Technology Co., Ltd, Shenzhen 518103, China
| | - Zuxin Chen
- Shenzhen Key Laboratory of Drug Addiction, Shenzhen Neher Neural Plasticity Laboratory, the Brain Cognition and Brain Disease Institute, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences (CAS); Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen 518055, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Jin Lu
- Laboratory of Life and Health Sciences, Shenzhen First union Technology Co., Ltd, Shenzhen 518103, China; Laboratory of Life and Health Sciences, Shenzhen Health Union Biotechnology Co., Ltd, Shenzhen 518103, China.
| | - Xin-An Liu
- Guangdong Provincial Key Laboratory of Brain Connectome and Behavior, CAS Key Laboratory of Brain Connectome and Manipulation, Brain Cognition and Brain Disease Institute (BCBDI), Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions, Shenzhen 518055, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Tackett AP, Urman R, Barrington-Trimis J, Liu F, Hong H, Pentz MA, Islam TS, Eckel SP, Rebuli M, Leventhal A, Samet JM, Berhane K, McConnell R. Prospective study of e-cigarette use and respiratory symptoms in adolescents and young adults. Thorax 2024; 79:163-168. [PMID: 37582630 PMCID: PMC11062480 DOI: 10.1136/thorax-2022-218670] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 07/03/2023] [Indexed: 08/17/2023]
Abstract
RATIONALE Electronic cigarette (e-cigarette) aerosol contains volatile aldehydes, including flavourings and oxidant metals with known pulmonary toxicity. OBJECTIVES To evaluate the associations of e-cigarette use with symptoms of wheeze, bronchitic symptoms and shortness of breath (SOB) across 4 years of prospective data. METHODS Participants completed questionnaires on respiratory symptoms and past 30-day e-cigarette, cigarette and cannabis use in 2014 (wave 1; N=2094; mean age 17.3 years, SD=0.6 years). Follow-up information was collected in 2015 (wave 2; n=1609), 2017 (wave 3; n=1502) and 2018 (wave 4; n=1637) using online surveys. Mixed-effects logistic regression models evaluated associations of e-cigarette use with respiratory symptoms. MEASUREMENTS AND MAIN RESULTS Participants were mostly Hispanic white (51.8%) and evenly representative by sex (49.6% female; 50.4% male). Compared with never e-cigarette users, past 30-day e-cigarette users reported increased odds of wheeze (OR 1.81; 95% CI 1.28, 2.56), bronchitic symptoms (OR 2.06; 95% CI 1.58, 2.69) and SOB (OR 1.78; 95% CI 1.23, 2.57), adjusting for study wave, age, sex, race, lifetime asthma diagnosis and parental education. Effect estimates were attenuated (wheeze (OR 1.41; 95% CI 0.99, 2.01), bronchitic symptoms (OR 1.55; 95% CI 1.18, 2.05), SOB (OR 1.48; 95% CI 1.01, 2.18)), after adjusting additionally for current cigarette use, cannabis use and secondhand exposure to e-cigarettes/cigarettes/cannabis. CONCLUSIONS E-cigarette use in young adults was associated with respiratory symptoms, independent of combustible cannabis and cigarette exposures.
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Affiliation(s)
- Alayna P Tackett
- Department of Internal Medicine, Division of Medical Oncology, Center for Tobacco Research, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Robert Urman
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
| | - Jessica Barrington-Trimis
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
| | - Feifei Liu
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
| | - Hanna Hong
- Division of Pulmonology, Children's Hospital of Orange County, Orange, California, USA
| | - Mary Ann Pentz
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
| | - Talat S Islam
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
| | - Sandrah P Eckel
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
| | - Meghan Rebuli
- Department of Pediatrics, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Adam Leventhal
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
| | - Jonathan M Samet
- Department of Epidemiology, Colorado School of Public Health, Aurora, Colorado, USA
| | - Kiros Berhane
- Department of Biostatistics, Columbia University, New York, New York, USA
| | - Rob McConnell
- Department of Population and Public Health Sciences, University of Southern California Keck School of Medicine, Los Angeles, California, USA
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10
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Oldham MJ, Jeong L, Gillman IG. An Approach to Flavor Chemical Thermal Degradation Analysis. TOXICS 2023; 12:16. [PMID: 38250972 PMCID: PMC10819574 DOI: 10.3390/toxics12010016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/14/2023] [Accepted: 12/20/2023] [Indexed: 01/23/2024]
Abstract
Toxicological evaluations of flavor chemicals for use in inhalation products that utilize heat for aerosol generation are complicated because of the potential effect heat may have on the flavor chemical. The objective was to develop a thermal degradation technique to screen flavor chemicals as part of a toxicological testing program for their potential use in ENDS formulations. Based upon published data for acetaldehyde, acrolein, and glycidol from ENDS products (common thermal degradants of propylene glycol and glycerin), the pyrolizer temperature was adjusted until a similar ratio of acetaldehyde, acrolein, and glycidol was obtained from a 60/40 ratio (v/v) of glycerin/propylene glycol via GC/MS analysis. For each of 90 flavor chemicals, quantitative measurements of acetaldehyde, acrolein, and glycidol, in addition to semiquantitative non-targeted analysis tentatively identifying chemicals from thermal degradation, were obtained. Twenty flavor chemicals transferred at greater than 99% intact, another 26 transferred at greater than 95% intact, and another 15 flavor chemicals transferred at greater than 90% intact. Most flavor chemicals resulted in fewer than 10-12 tentatively identified thermal degradants. The practical approach to the thermal degradation of flavor chemicals provided useful information as part of the toxicological evaluation of flavor chemicals for potential use in ENDS formulations.
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11
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Schichlein KD, Love CA, Conolly MP, Kurz JL, Hickman ED, Clapp PW, Jaspers I. Vaping product exposure system (VaPES): a novel in vitro aerosol deposition system. Inhal Toxicol 2023; 35:324-332. [PMID: 38054423 PMCID: PMC10788097 DOI: 10.1080/08958378.2023.2289021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 11/20/2023] [Indexed: 12/07/2023]
Abstract
OBJECTIVE Due to recent increases in the use of vaping devices, there is a high demand for research addressing the respiratory health effects of vaping products. Given the constantly changing nature of the vaping market with new devices, flavors, metals, and other chemicals rapidly emerging, there is a need for inexpensive and highly adaptable vaping device exposure systems. Here, we describe the design and validation of a novel in vitro aerosol exposure system for toxicity testing of vaping devices. MATERIALS AND METHODS We developed an inexpensive, open-source in vitro vaping device exposure system that produces even deposition, can be adapted for different vaping devices, and allows for experiments to be performed under physiological conditions. The system was then validated with deposition testing and a representative exposure with human bronchial epithelial cells (hBECs). RESULTS The Vaping Product Exposure System (VaPES) produced sufficient and uniform deposition for dose-response studies and was precise enough to observe biological responses to vaping exposures. VaPES was adapted to work with both pod and cartridge-based vaping devices. CONCLUSION We have designed and validated a novel vaping device exposure system that will eliminate the need to use high-cost commercial exposure systems, lowering the barrier to entry of physiologically relevant vaping studies.
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Affiliation(s)
- Kevin D. Schichlein
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Charlotte A. Love
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Maxwell P. Conolly
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - John L. Kurz
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Elise D. Hickman
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Phillip W. Clapp
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Ilona Jaspers
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
- Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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12
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Guo X, Chan YC, Gautam T, Zhao R. Autoxidation of glycols used in inhalable daily products: implications for the use of artificial fogs and e-cigarettes. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2023; 25:1657-1669. [PMID: 37728872 DOI: 10.1039/d3em00214d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
The use of glycols is seen in various industries and occupations. In the past few decades, the health implications of inhalable glycols have gained public attention. Inhalable glycols may cause adverse health effects, especially for workers in occupations receiving frequent exposure and consumers of glycol-based daily products. Our previous work highlighted the rapid accumulation of formaldehyde and glycolaldehyde in fog juice, thus proposing the occurrence of glycol autoxidation. However, the fundamentals of glycol autoxidation remained unclear and unexplored. Our goal is to investigate the autoxidation of common glycols during indoor storage. Carbonyls were quantified using liquid chromatography-mass spectrometry (LC-MS), and peroxides from autoxidation were monitored via iodometry and UV-Vis spectrometry. The impact of certain factors such as the water mixing ratio and antioxidants (vitamin C) was also investigated. Formation of aldehydes in many glycols was weekly monitored, such as e-cigarette juice and triethylene glycol (TEG). Occurrence of autoxidation was confirmed by the increase in the total peroxide concentration. Additionally, we highlighted the dependence of the carbonyl formation rate on the TEG-water mixing ratio, demonstrating the complex role of water in glycol autoxidation. We have also tested the effectiveness of vitamin C and made suggestions for minimizing the formation of toxic carbonyls in consumer products.
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Affiliation(s)
- Xinyang Guo
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
| | - Ya-Chun Chan
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
| | - Tania Gautam
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
| | - Ran Zhao
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
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13
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Soulet S, Constans L, Quinty V. Physical and chemical characterizations of a reference e-cigarette used in animal testing. Sci Rep 2023; 13:16624. [PMID: 37789124 PMCID: PMC10547745 DOI: 10.1038/s41598-023-43733-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 09/27/2023] [Indexed: 10/05/2023] Open
Abstract
A minimal necessary condition for preclinical studies to contribute to risk assessments of e-cigarettes (ECs) is the ability to expose laboratory animals to an appropriate dosage of aerosols. In this study, we examined the fulfilment of this essential consistency condition for the ECX-Joyetech E-Vic Mini (ECX), a piece of computerized exposure equipment manufactured by SCIREQ, which has been employed by numerous in vivo testing. We began by calibrating the customary Evic VTC mini device mod and the 4 coils available, reproducing in the laboratory the operation of the ECX in the power-control and temperature-control modes, using puffing parameters recommended by its documentation. We then conducted the following tests for each coil: (1) verifying whether the generated aerosols satisfy an optimal operational regime, free from overheating, as determined by a linear relation between the mass of vaporized e-liquid vs. supplied power and (2) obtaining the mean yields of aldehydes for each of the tested power settings and coils. The results of these tests show that, under the main conditions used in in vivo testing, the ECX equipment fails to comply with these consistency requirements, especially for coils with low subohm resistance, a shortcoming that can be corrected by applying much larger airflows for these coils. Therefore, the outcomes of preclinical studies using the ECX equipment should be examined with great scepticism and subjected to further testing.
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Affiliation(s)
| | - Léa Constans
- Ingesciences, 2 Chemin Des Arestrieux, 33610, Cestas, France
| | - Vanille Quinty
- Ingesciences, 2 Chemin Des Arestrieux, 33610, Cestas, France
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14
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Augustini ALRM, Borg C, Sielemann S, Telgheder U. Making Every Single Puff Count-Simple and Sensitive E-Cigarette Aerosol Sampling for GCxIMS and GC-MS Analysis. Molecules 2023; 28:6574. [PMID: 37764350 PMCID: PMC10536117 DOI: 10.3390/molecules28186574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 08/31/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
The analysis of the aerosol from tobaccoless electronic cigarettes (e-cigarettes) is an important part of understanding their impact on human health, yet sampling aerosol from e-cigarettes is still considered a challenge. It lacks a standard method for research and quality control and there are a variety of methods. However, few are simple and inexpensive, and none have been suggested for the use with gas chromatography coupled ion mobility spectrometry (GCxIMS). This work presents and evaluates such a setup made from standard lab equipment to quickly collect a quantitative sample from the aerosol of a single puff (5 s totaling 125 mL). The aerosol condensates directly in the cooled headspace (HS) vial, which is analyzed in the HS-GCxIMS or mass spectrometer (HS-GC-MS). The combined use of GC-MS and GCxIMS allows the simple and sensitive identification of unknown substances in complex mixtures and the identification of degradation products in the aerosols. A calibration of 26 flavor compounds (0.2-20 µg/g) was created using single puffs of a spiked, flavorless commercial refill solution and 2-alkanones as internal standards. This sensitive but easily reproducible setup enables a wide range of further investigations, even for labs that were previously unable to afford it.
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Affiliation(s)
- Alexander L. R. M. Augustini
- Department Hamm 2, Hamm-Lippstadt University of Applied Sciences, Marker Allee 76-78, 59063 Hamm, Germany; (A.L.R.M.A.)
- Faculty of Chemistry, Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141 Essen, Germany
| | - Christopher Borg
- Department Hamm 2, Hamm-Lippstadt University of Applied Sciences, Marker Allee 76-78, 59063 Hamm, Germany; (A.L.R.M.A.)
| | - Stefanie Sielemann
- Department Hamm 2, Hamm-Lippstadt University of Applied Sciences, Marker Allee 76-78, 59063 Hamm, Germany; (A.L.R.M.A.)
| | - Ursula Telgheder
- Faculty of Chemistry, Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141 Essen, Germany
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15
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Tran LN, Chiu EY, Hunsaker HC, Wu KC, Poulin BA, Madl AK, Pinkerton KE, Nguyen TB. Carbonyls and Aerosol Mass Generation from Vaping Nicotine Salt Solutions Using Fourth- and Third-Generation E-Cigarette Devices: Effects of Coil Resistance, Coil Age, and Coil Metal Material. Chem Res Toxicol 2023. [PMID: 37698991 PMCID: PMC10583227 DOI: 10.1021/acs.chemrestox.3c00172] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Indexed: 09/14/2023]
Abstract
Aerosol formation and production yields from 11 carbonyls (carbonyl concentration per aerosol mass unit) were investigated (1) from a fourth-generation (4th gen) e-cigarette device at different coil resistances and coil age (0-5000 puffs) using unflavored e-liquid with 2% benzoic acid nicotine salt, (2) between a sub-ohm third-generation (3rd gen) tank mod at 0.12 Ω and a 4th gen pod at 1.2 Ω using e-liquid with nicotine salt, together with nicotine yield, and (3) from 3rd gen coils of different metals (stainless steel, kanthal, nichrome) using e-liquid with freebase nicotine. Coil resistance had an inverse relationship with coil temperature, and coil temperature was directly proportional to aerosol mass formation. Trends in carbonyl yields depended on carbonyl formation mechanisms. Carbonyls produced primarily from thermal degradation chemistry (e.g., formaldehyde, acetaldehyde, acrolein, propionaldehyde) increased per aerosol mass with higher coil resistances, despite lower coil temperature. Carbonyls produced primarily from chemistry initiated by reactive oxygen species (ROS) (e.g., hydroxyacetone, dihydroxyacetone, methylglyoxal, glycolaldehyde, lactaldehyde) showed the opposite trend. Coil age did not alter coil temperature nor aerosol mass formation but had a significant effect on carbonyl formation. Thermal carbonyls were formed optimally at 500 puffs in our study and then declined to a baseline, whereas ROS-derived carbonyls showed a slow rise to a maximum trend with coil aging. The 3rd gen versus 4th gen device comparison mirrored the trends in coil resistance. Nicotine yields per aerosol mass were consistent between 3rd and 4th gen devices. Coil material did not significantly alter aerosol formation nor carbonyl yield when adjusted for wattage. This work shows that sub-ohm coils may not necessarily produce higher carbonyl yields even when they produce more aerosol mass. Furthermore, carbonyl formation is dynamic and not generalizable during the coil's lifetime. Finally, studies that compare data across different e-cigarette devices, coil age, and coil anatomy should account for the aerosol chemistry trends that depend on these parameters.
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Affiliation(s)
- Lillian N Tran
- Department of Environmental Toxicology, University of California, Davis, Davis, California 95616, United States
| | - Elizabeth Y Chiu
- Department of Environmental Toxicology, University of California, Davis, Davis, California 95616, United States
| | - Haylee C Hunsaker
- Department of Chemistry, University of California, Davis, Davis, California 95616, United States
| | - Kuan-Chen Wu
- Department of Chemistry, University of California, Davis, Davis, California 95616, United States
| | - Brett A Poulin
- Department of Environmental Toxicology, University of California, Davis, Davis, California 95616, United States
| | - Amy K Madl
- Center for Health and the Environment, University of California, Davis, Davis, California 95616, United States
| | - Kent E Pinkerton
- Center for Health and the Environment, University of California, Davis, Davis, California 95616, United States
| | - Tran B Nguyen
- Department of Environmental Toxicology, University of California, Davis, Davis, California 95616, United States
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16
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Jameson JB, Wang J, Bailey PC, Oldham MJ, Smith CR, Jeong LN, Cook DK, Bates AL, Ullah S, Pennington ASC, Gillman IG. Determination of chemical constituent yields in e-cigarette aerosol using partial and whole pod collections, a comparative analysis. Front Chem 2023; 11:1223967. [PMID: 37744056 PMCID: PMC10512464 DOI: 10.3389/fchem.2023.1223967] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 08/18/2023] [Indexed: 09/26/2023] Open
Abstract
Literature reports the chemical constituent yields of electronic nicotine delivery systems (ENDS) aerosol collected using a range of aerosol collection strategies. The number of puffs to deplete an ENDS product varies widely, but collections often consist of data from the first 50-100 puffs. However, it is not clear whether these discrete puff blocks are representative of constituent yields over the life of a pod. We aimed to assess the effect of differing aerosol collection strategies on reported yields for select chemical constituents in the aerosol of closed pod-based ENDS products. Constituents analyzed were chosen to reflect important classes of compounds from the Final Premarket Tobacco Product Application Guidance. Yields were normalized to total device mass loss (DML). Collection strategies that consisted of partial pod collection were valid for determining yields of constituents whose DML normalized yields were consistent for the duration of pod life. These included primary aerosol constituents, such as propylene glycol, glycerol, and nicotine, and whole pod yields could be determined from initial puff blocks. However, changes were observed in the yields of some metals, some carbonyl compounds, and glycidol over pod life in a chemical constituent and product dependent manner. These results suggest that collection strategies consisting of initial puff block collections require validation per chemical constituent/product and are not appropriate for chemical constituents with variable yields over pod life. Whole pod collection increased sensitivity and accuracy in determining metal, carbonyl, and glycidol yields compared to puff block-based collection methodologies for all products tested.
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17
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Rose JE, Frisbee S, Campbell D, Salley A, Claerhout S, Davis JM. Smoking reduction using electronic nicotine delivery systems in combination with nicotine skin patches. Psychopharmacology (Berl) 2023; 240:1901-1909. [PMID: 37458789 PMCID: PMC10471641 DOI: 10.1007/s00213-023-06401-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 06/05/2023] [Indexed: 09/01/2023]
Abstract
RATIONALE Electronic nicotine delivery systems (ENDS) are used by smokers seeking to reduce combustible cigarette (CC) use, but the role of nicotine replacement vs. behavioral and sensory factors is still poorly understood. We hypothesized that providing nicotine from ENDS in addition to nicotine skin patches would promote smoking reduction relative to non-nicotine control ENDS. OBJECTIVES To assess the effects on smoking behavior of using nicotine vs. placebo ENDS in smokers using nicotine vs. placebo patches. METHODS Ninety-four daily smokers were enrolled in a study that randomly assigned them to receive ENDS with nicotine vs. without nicotine and skin patches with vs. without nicotine. Smoking reduction and cessation were assessed over an 8-week period by self-report and by expired air carbon monoxide (CO) measurements. The primary outcome was defined as reduction in expired air CO. RESULTS The use of nicotine in ENDS led to significant reductions in smoking (ENDS nicotine vs. placebo difference in CO change = -9.2 ppm; 90% CI (-1.5 ppm, -16.9 ppm)) and was highly correlated with reductions in self-reported cigarettes per day (r=0.6). The effect of nicotine in nicotine patches was not statistically significant (patch nicotine vs. placebo difference in CO change = -0.1 ppm; 90% CI (-7.8 ppm, 7.6 ppm)). CONCLUSIONS The presence of nicotine in ENDS was associated with a large reduction in smoking. Additional studies will be needed to determine whether there may be additive effects of nicotine ENDS and nicotine patches on smoking abstinence.
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Affiliation(s)
- Jed E Rose
- Duke Center for Smoking Cessation, Duke University School of Medicine, 2424 Erwin Road, Suite 201, Durham, NC, 27705, USA.
| | - Suzanne Frisbee
- Duke Center for Smoking Cessation, Duke University School of Medicine, 2424 Erwin Road, Suite 201, Durham, NC, 27705, USA
| | - David Campbell
- Duke Center for Smoking Cessation, Duke University School of Medicine, 2424 Erwin Road, Suite 201, Durham, NC, 27705, USA
| | - Alfred Salley
- Duke Center for Smoking Cessation, Duke University School of Medicine, 2424 Erwin Road, Suite 201, Durham, NC, 27705, USA
| | - Susan Claerhout
- Duke Center for Smoking Cessation, Duke University School of Medicine, 2424 Erwin Road, Suite 201, Durham, NC, 27705, USA
| | - James M Davis
- Duke Center for Smoking Cessation, Duke University School of Medicine, 2424 Erwin Road, Suite 201, Durham, NC, 27705, USA
- Duke Cancer Institute, Durham, NC, USA
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18
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Crespi E, Hardesty JJ, Nian Q, Sinamo J, Welding K, Cohen JE, David Kennedy R. Device and liquid characteristics used with sweet, menthol/mint, and tobacco ENDS liquid flavors: The population-based VAPER study. Addict Behav 2023; 144:107727. [PMID: 37119714 PMCID: PMC10330428 DOI: 10.1016/j.addbeh.2023.107727] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 03/09/2023] [Accepted: 04/12/2023] [Indexed: 05/01/2023]
Abstract
INTRODUCTION Electronic nicotine delivery system (ENDS) device and liquid characteristics (e.g., wattage, nicotine concentration) are diverse and important in determining product appeal, aerosol volume/nicotine levels, and toxicity. Little is known about how device and liquid characteristics vary by flavor; we address this gap to identify potential regulatory implications. METHODS Data are from a longitudinal cohort study (Waves 2 and 3; December 2020-December 2021) of adult (≥21 years) U.S. ENDS users (≥5 days of use/week). Participants (n = 1809) reported on and submitted photos of their most used device and liquid. Participants were categorized into flavor groups of high prevalence in our sample and in prior literature: sweet, menthol/mint, or tobacco. Participants using liquids without nicotine or flavors other than sweet, menthol/mint, or tobacco were excluded (n = 320). Data were analyzed cross-sectionally. Chi-square and linear regression (n = 1489) were used to examine device and liquid characteristics by flavor. RESULTS Sweet flavors were most common (n = 1135; 76.2%), followed by menthol/mint (n = 214, 14.4%) and tobacco (n = 140, 9.4%). Sweet flavors were less common among participants using reusable devices with disposable pods/cartridges (nicotine salt) than those using other device-liquid groupings (5.2% vs 86.5-93.9%; p < 0.001). Sweet flavors were less common among those using ENDS for non-flavor reasons vs the flavor (73.5% vs 90.4%; p < 0.001). Sweet flavors correlated with lower nicotine concentrations, higher wattages, and lower ages of ENDS first use (p < 0.001). CONCLUSIONS Regulatory agencies must consider how regulations on device and liquid characteristics may affect ENDS users' behaviors (e.g., limiting availability of sweet flavors may encourage use of non-sweet flavors and lower wattages).
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Affiliation(s)
- Elizabeth Crespi
- Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior, and Society, Institute for Global Tobacco Control, Baltimore, MD, USA.
| | - Jeffrey J Hardesty
- Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior, and Society, Institute for Global Tobacco Control, Baltimore, MD, USA.
| | - Qinghua Nian
- Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior, and Society, Institute for Global Tobacco Control, Baltimore, MD, USA.
| | - Joshua Sinamo
- Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior, and Society, Institute for Global Tobacco Control, Baltimore, MD, USA.
| | - Kevin Welding
- Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior, and Society, Institute for Global Tobacco Control, Baltimore, MD, USA.
| | - Joanna E Cohen
- Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior, and Society, Institute for Global Tobacco Control, Baltimore, MD, USA.
| | - Ryan David Kennedy
- Johns Hopkins Bloomberg School of Public Health, Department of Health, Behavior, and Society, Institute for Global Tobacco Control, Baltimore, MD, USA.
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19
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Talih S, Salman R, Karaoghlanian N, El-Hellani A, Shihadeh A. Carbonyl Emissions and Heating Temperatures across 75 Nominally Identical Electronic Nicotine Delivery System Products: Do Manufacturing Variations Drive Pulmonary Toxicant Exposure? Chem Res Toxicol 2023; 36:342-346. [PMID: 36795024 PMCID: PMC10031554 DOI: 10.1021/acs.chemrestox.2c00391] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Indexed: 02/17/2023]
Abstract
Studies of factors that impact electronic nicotine delivery systems (ENDSs) carbonyl compound (CC) emissions have been hampered by wide within-condition variability. In this study, we examined whether this variability may be related to heating coil temperature variations stemming from manufacturing differences. We determined the mean peak temperature rise (ΔTmax) and CC emissions from 75 Subox ENDSs powered at 30 W. We found that ΔTmax and CC emissions varied widely, with greater ΔTmax resulting in exponentially higher CC emissions. Also, 12% of atomizers accounted for 85% of total formaldehyde emissions. These findings suggest that major reductions in toxicant exposure might be achieved through regulations focusing on limiting coil temperature.
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Affiliation(s)
- Soha Talih
- Mechanical
Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, Bliss Street, P.O.
Box 11-0236, Beirut, Lebanon
- Center
for the Study of Tobacco Products, Virginia
Commonwealth University, 821 West Franklin Street, Richmond, Virginia 23284, United
States
| | - Rola Salman
- Mechanical
Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, Bliss Street, P.O.
Box 11-0236, Beirut, Lebanon
- Center
for the Study of Tobacco Products, Virginia
Commonwealth University, 821 West Franklin Street, Richmond, Virginia 23284, United
States
| | - Nareg Karaoghlanian
- Mechanical
Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, Bliss Street, P.O.
Box 11-0236, Beirut, Lebanon
- Center
for the Study of Tobacco Products, Virginia
Commonwealth University, 821 West Franklin Street, Richmond, Virginia 23284, United
States
| | - Ahmad El-Hellani
- Environmental
Health Sciences, College of Public Health, The Ohio State University, 1841 Neil Ave., Columbus, Ohio 43210, United States
| | - Alan Shihadeh
- Mechanical
Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, Bliss Street, P.O.
Box 11-0236, Beirut, Lebanon
- Center
for the Study of Tobacco Products, Virginia
Commonwealth University, 821 West Franklin Street, Richmond, Virginia 23284, United
States
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20
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Dempsey R, Rodrigo G, Vonmoos F, Gunduz I, Belushkin M, Esposito M. Preliminary toxicological assessment of heated tobacco products: A review of the literature and proposed strategy. Toxicol Rep 2023; 10:195-205. [PMID: 36748021 PMCID: PMC9898577 DOI: 10.1016/j.toxrep.2023.01.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 12/20/2022] [Accepted: 01/18/2023] [Indexed: 01/21/2023] Open
Abstract
Heated tobacco products (HTP) have become increasingly common in many countries worldwide. The principle of heating tobacco, without combustion, to produce a nicotine-containing aerosol with remarkably reduced levels of other known toxins, compared to combusted tobacco cigarettes, is now well established. As these products are intended as alternatives to traditional combusted products, during the early stages of their development, it is important for manufacturers to ensure that the design of the product does not lead to any unintentionally increased or new risk for the consumer, compared to the traditional products that consumers seek to replace. There is limited guidance from tobacco product regulations concerning the requirements for performing such preliminary toxicological assessments. Here, we review the published literature on studies performed on HTPs in the pursuit of such data, outline a proposed approach that is consistent with regulatory requirements, and provide a logical approach to the preliminary toxicological assessment of HTPs.
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Affiliation(s)
- Ruth Dempsey
- RD Science Speaks Consultancy Sàrl, Le Mont sur Lausanne, Switzerland
| | - Gregory Rodrigo
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000 Neuchâtel, Switzerland
| | - Florence Vonmoos
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000 Neuchâtel, Switzerland
| | - Irfan Gunduz
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000 Neuchâtel, Switzerland
| | - Maxim Belushkin
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000 Neuchâtel, Switzerland
| | - Marco Esposito
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000 Neuchâtel, Switzerland
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21
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Canchola A, Langmo S, Meletz R, Lum M, Lin YH. External Factors Modulating Vaping-Induced Thermal Degradation of Vitamin E Acetate. Chem Res Toxicol 2023; 36:83-93. [PMID: 36534744 PMCID: PMC9846828 DOI: 10.1021/acs.chemrestox.2c00298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Indexed: 12/23/2022]
Abstract
Despite previous studies indicating the thermal stability of vitamin E acetate (VEA) at low temperatures, VEA has been shown to readily decompose into various degradation products such as alkenes, long-chain alcohols, and carbonyls such as duroquinone (DQ) at vaping temperatures of <200 °C. While most models simulate the thermal decomposition of e-liquids under pyrolysis conditions, numerous factors, including vaping behavior, device construction, and the surrounding environment, may impact the thermal degradation process. In this study, we investigated the role of the presence of molecular oxygen (O2) and transition metals in promoting thermal oxidation of e-liquids, resulting in greater degradation than predicted by pure pyrolysis. Thermal degradation of VEA was performed in inert (N2) and oxidizing atmospheres (clean air) in the absence and presence of Ni-Cr and Cu-Ni alloy nanopowders, metals commonly found in the heating coil and body of e-cigarettes. VEA degradation was analyzed using thermogravimetric analysis (TGA) and gas chromatography/mass spectrometry (GC/MS). While the presence of O2 was found to significantly enhance the degradation of VEA at both high (356 °C) and low (176 °C) temperatures, the addition of Cu-Ni to oxidizing atmospheres was found to greatly enhance VEA degradation, resulting in the formation of numerous degradation products previously identified in VEA vaping emissions. O2 and Cu-Ni nanopowder together were also found to significantly increase the production of OH radicals, which has implications for e-liquid degradation pathways as well as the potential risk of oxidative damage to biological systems in real-world vaping scenarios. Ultimately, the results presented in this study highlight the importance of oxidation pathways in VEA thermal degradation and may aid in the prediction of thermal degradation products from e-liquids.
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Affiliation(s)
- Alexa Canchola
- Environmental
Toxicology Graduate Program, University
of California, Riverside, California 92521, United States
| | - Siri Langmo
- Department
of Evolution, Ecology, and Organismal Biology, University of California, Riverside, California 92521, United States
| | - Ruth Meletz
- Department
of Environmental Sciences, University of
California, Riverside, California 92521, United States
| | - Michael Lum
- Department
of Environmental Sciences, University of
California, Riverside, California 92521, United States
| | - Ying-Hsuan Lin
- Environmental
Toxicology Graduate Program, University
of California, Riverside, California 92521, United States
- Department
of Environmental Sciences, University of
California, Riverside, California 92521, United States
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22
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Rebuli ME, Rose JJ, Noël A, Croft DP, Benowitz NL, Cohen AH, Goniewicz ML, Larsen BT, Leigh N, McGraw MD, Melzer AC, Penn AL, Rahman I, Upson D, Crotty Alexander LE, Ewart G, Jaspers I, Jordt SE, Kligerman S, Loughlin CE, McConnell R, Neptune ER, Nguyen TB, Pinkerton KE, Witek TJ. The E-cigarette or Vaping Product Use-Associated Lung Injury Epidemic: Pathogenesis, Management, and Future Directions: An Official American Thoracic Society Workshop Report. Ann Am Thorac Soc 2023; 20:1-17. [PMID: 36584985 PMCID: PMC9819258 DOI: 10.1513/annalsats.202209-796st] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
E-cigarette or vaping product use-associated lung injury (EVALI) is a severe pulmonary illness associated with the use of e-cigarettes or vaping products that was officially identified and named in 2019. This American Thoracic Society workshop was convened in 2021 to identify and prioritize research and regulatory needs to adequately respond to the EVALI outbreak and to prevent similar instances of disease associated with e-cigarette or vaping product use. An interdisciplinary group of 26 experts in adult and pediatric clinical care, public health, regulatory oversight, and toxicology were convened for the workshop. Four major topics were examined: 1) the public health and regulatory response to EVALI; 2) EVALI clinical care; 3) mechanisms contributing to EVALI; and 4) needed actions to address the health effects of EVALI. Oral presentations and group discussion were the primary modes used to identify top priorities for addressing EVALI. Initiatives including a national EVALI case registry and biorepository, integrated electronic medical record coding system, U.S. Food and Drug Administration regulation and enforcement of nicotine e-cigarette standards, regulatory authority over nontobacco-derived e-cigarettes, training in evaluating exogenous exposures, prospective clinical studies, standardized clinical follow-up assessments, ability to more readily study effects of cannabinoid e-cigarettes, and research to identify biomarkers of exposure and disease were identified as critical needs. These initiatives will require substantial federal investment as well as changes to regulatory policy. Overall, the workshop identified the need to address the root causes of EVALI to prevent future outbreaks. An integrated approach from multiple perspectives is required, including public health; clinical, basic, and translational research; regulators; and users of e-cigarettes. Improving the public health response to reduce the risk of another substantial disease-inducing event depends on coordinated actions to better understand the inhalational toxicity of these products, informing the public of the risks, and developing and enforcing regulatory standards for all e-cigarettes.
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Noël A, Ghosh A. Carbonyl Profiles of Electronic Nicotine Delivery System (ENDS) Aerosols Reflect Both the Chemical Composition and the Numbers of E-Liquid Ingredients-Focus on the In Vitro Toxicity of Strawberry and Vanilla Flavors. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:16774. [PMID: 36554655 PMCID: PMC9779252 DOI: 10.3390/ijerph192416774] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Propylene glycol (PG) and glycerin (G) are the most widely used humectants in electronic nicotine delivery system (ENDS) devices. Carbonyls are present in aerosols produced when ENDS devices heat PG and G. Whether aerosolized PG and G are innocuous to the lungs has not been established. Here, we determined the chemical profiles of ENDS aerosols containing three humectant ratios (30/70, 50/50 and 70/30, PG/VG), for three flavors (strawberry, vanilla and Catalan cream) containing either 12 or 18 mg/mL of nicotine. Additionally, we examined the in vitro toxicity of the strawberry- and vanilla-flavored ENDS aerosol in human lung epithelial cells (BEAS-2B) exposed at the air-liquid interface for 1 h. For strawberry- and vanilla-flavored aerosols produced by a 3rd-generation ENDS device with the same PG/G ratio, the e-liquid nicotine content of 12 and 18 mg/mL did not transfer to the aerosol with substantial differences in concentrations. Our data also indicate the presence of carbonyls in all three flavored e-cig aerosols analyzed, with levels exceeding 1 µg/puff for acetone, butyraldehyde, and acetaldehyde, in strawberry-, vanilla, and Catalan cream-flavored e-cig aerosols, respectively. Furthermore, closed-system ENDS of the fourth generation emitted trace levels of carbonyls in the aerosols (<0.3 µg/puff), while open-system tank-style ENDS of the third generation produced elevated levels of harmful chemicals, including acrolein (>1 µg/puff), formaldehyde (>5 µg/puff), and m- & p-tolualdehyde (>4 µg/puff). Moreover, under non-cytotoxic conditions, BEAS-2B cells exposed to strawberry-flavored aerosols exhibited significantly increased reactive oxygen and nitric oxide species (ROS/NOS) levels in cell media compared to air controls, while vanilla-flavored ENDS aerosols up-regulated the expression of pro-inflammatory and oxidative stress markers. Our data suggest (a) that ENDS aerosol chemical composition will vary based upon the presence and concentration of the initial e-liquid ingredients, with a pronounced impact of the flavoring components; and (b) short-term exposures to flavored ENDS aerosols may impair lung cells' redox signaling in a flavor-specific manner.
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24
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Wong ET, Luettich K, Cammack L, Chua CS, Sciuscio D, Merg C, Corciulo M, Piault R, Ashutosh K, Smith C, Leroy P, Moine F, Glabasnia A, Diana P, Chia C, Tung CK, Ivanov N, Hoeng J, Peitsch M, Lee KM, Vanscheeuwijck P. Assessment of inhalation toxicity of cigarette smoke and aerosols from flavor mixtures: 5-week study in A/J mice. J Appl Toxicol 2022; 42:1701-1722. [PMID: 35543240 PMCID: PMC9545811 DOI: 10.1002/jat.4338] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 04/20/2022] [Accepted: 05/05/2022] [Indexed: 11/10/2022]
Abstract
Most flavors used in e-liquids are generally recognized as safe for oral consumption, but their potential effects when inhaled are not well characterized. In vivo inhalation studies of flavor ingredients in e-liquids are scarce. A structure-based grouping approach was used to select 38 flavor group representatives (FGR) on the basis of known and in silico-predicted toxicological data. These FGRs were combined to create prototype e-liquid formulations and tested against cigarette smoke (CS) in a 5-week inhalation study. Female A/J mice were whole-body exposed for 6 h/day, 5 days/week, for 5 weeks to air, mainstream CS, or aerosols from (1) test formulations containing propylene glycol (PG), vegetable glycerol (VG), nicotine (N; 2% w/w), and flavor (F) mixtures at low (4.6% w/w), medium (9.3% w/w), or high (18.6% w/w) concentration or (2) base formulation (PG/VG/N). Male A/J mice were exposed to air, PG/VG/N, or PG/VG/N/F-high under the same exposure regimen. There were no significant mortality or in-life clinical findings in the treatment groups, with only transient weight loss during the early exposure adaptation period. While exposure to flavor aerosols did not cause notable lung inflammation, it caused only minimal adaptive changes in the larynx and nasal epithelia. In contrast, exposure to CS resulted in lung inflammation and moderate-to-severe changes in the epithelia of the nose, larynx, and trachea. In summary, the study evaluates an approach for assessing the inhalation toxicity potential of flavor mixtures, thereby informing the selection of flavor exposure concentrations (up to 18.6%) for a future chronic inhalation study.
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Affiliation(s)
- Ee Tsin Wong
- PMI R&DPhilip Morris International Research Laboratories Pte LtdSingapore
| | | | - Lydia Cammack
- PMI R&DPhilip Morris International Research Laboratories Pte LtdSingapore
| | - Chin Suan Chua
- PMI R&DPhilip Morris International Research Laboratories Pte LtdSingapore
| | | | - Celine Merg
- PMI R&DPhilip Morris Products S.ANeuchâtelSwitzerland
| | | | - Romain Piault
- PMI R&DPhilip Morris Products S.ANeuchâtelSwitzerland
| | | | | | - Patrice Leroy
- PMI R&DPhilip Morris Products S.ANeuchâtelSwitzerland
| | - Fabian Moine
- PMI R&DPhilip Morris Products S.ANeuchâtelSwitzerland
| | | | | | - Cecilia Chia
- PMI R&DPhilip Morris International Research Laboratories Pte LtdSingapore
| | - Ching Keong Tung
- PMI R&DPhilip Morris International Research Laboratories Pte LtdSingapore
| | | | - Julia Hoeng
- PMI R&DPhilip Morris Products S.ANeuchâtelSwitzerland
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25
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How Electronic Cigarette Affects the Vascular System. J Smok Cessat 2022; 2022:3216580. [PMID: 36262466 PMCID: PMC9553677 DOI: 10.1155/2022/3216580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 09/13/2022] [Indexed: 11/17/2022] Open
Abstract
The popularity of the electronic cigarette has soared in the last decades. However, the health effect of smoking electronic cigarettes on the vascular system is unclear. This systematic review examines the electronic cigarettes’ effect on the vascular system from recent evidence. A systematic search was conducted in MEDLINE (PubMed) database from January 2016 to August 2021 for studies assessing the vascular effect of chronic use of electronic cigarettes on human and animal. The Cochrane Risk of Bias 2, NIH Quality Assessment for Cross-Sectional Study, and SYRCLE’s Risk of Bias were used to assess the risk of bias in interventional, observational, and animal study, respectively. A narrative synthesis of evidence is provided to describe results. From 101 retrieved studies related to electronic cigarettes effect on the vascular system, a total of 16 studies are included in this review. The overall results indicated that electronic cigarette use is associated with adverse events in the vascular, including the incident of elevated oxidative stress, endothelial dysfunction, inflammation, arterial stiffness, and the development of atherosclerotic lesion. Further studies should broaden perspectives and reveal more about the mechanism of how electronic cigarettes impact on vascular system.
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26
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Khaled Z, Dahmash EZ, Koner J, Ani RA, Alyami H, Naser AY. Assessment of Vaping Devices as an Alternative Respiratory Drug Delivery System. Drug Dev Ind Pharm 2022; 48:446-456. [DOI: 10.1080/03639045.2022.2123926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Zaid Khaled
- Department of Applied Pharmaceutical Sciences and Clinical Pharmacy, Faculty of Pharmacy, Isra University, Amman, Jordan.
| | - Eman Zmaily Dahmash
- Department of Applied Pharmaceutical Sciences and Clinical Pharmacy, Faculty of Pharmacy, Isra University, Amman, Jordan.
| | | | - Raad Al Ani
- Department of Applied Pharmaceutical Sciences and Clinical Pharmacy, Faculty of Pharmacy, Isra University, Amman, Jordan.
| | - Hamad Alyami
- Department of Pharmaceutics, Faculty of Pharmacy, Najran University, Najran, Saudi Arabia
| | - Abdallah, Y. Naser
- Department of Applied Pharmaceutical Sciences and Clinical Pharmacy, Faculty of Pharmacy, Isra University, Amman, Jordan.
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27
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Guo X, Ehindero T, Lau C, Zhao R. Impact of glycol-based solvents on indoor air quality-Artificial fog and exposure pathways of formaldehyde and various carbonyls. INDOOR AIR 2022; 32:e13100. [PMID: 36168228 DOI: 10.1111/ina.13100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 07/20/2022] [Accepted: 08/02/2022] [Indexed: 06/16/2023]
Abstract
Artificial fog is commonly employed in the entertainment industry and indoor household celebrations. The fog is generated from glycol-based solvents, which can also be found in e-cigarettes and personal care products. Although potential health impacts of glycol inhalation are frequently cited by studies of e-cigarette smoking, the dynamics and the chemical composition of glycol-based aerosols have never been studied systematically. The objective of this work is to investigate the impact of glycol-based aerosol on indoor air quality. Specifically, we targeted artificial fogs generated with common glycols, including propylene glycol (PG) and triethylene glycol (TEG). With the aid of a novel aerosol collecting and monitoring instrument setup, we obtained time-resolved aerosol profiles and their chemical compositions in an experimental room. Artificial fog has given rise to a significant amount of ultra-fine particulate matter, demonstrating its negative impact on indoor air quality. Additionally, we found a high concentration (9.75 mM) of formaldehyde and other carbonyls in fog machine fluids stored for months. These compounds are introduced to the indoor air upon artificial fog application. We propose that carbonyls have accumulated from the oxidative decomposition of glycols, initiated by OH radicals and singlet oxygens (1 O2 ) and likely sustained by autooxidation. Oxidation of glycols by indoor oxidants has never been reported previously. Such chemical processes can represent an unrecognized source of toxic carbonyl compounds which is also applicable to other glycol-based solvents.
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Affiliation(s)
- Xinyang Guo
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
| | - Toluwatise Ehindero
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
- Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada
| | - Chester Lau
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
| | - Ran Zhao
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada
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28
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Nicholson T, Davis L, Davis ET, Newton Ede M, Scott A, Jones SW. e-Cigarette Vapour Condensate Reduces Viability and Impairs Function of Human Osteoblasts, in Part, via a Nicotine Dependent Mechanism. TOXICS 2022; 10:506. [PMID: 36136470 PMCID: PMC9504563 DOI: 10.3390/toxics10090506] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/24/2022] [Accepted: 08/25/2022] [Indexed: 06/16/2023]
Abstract
Cigarette consumption negatively impacts bone quality and is a risk-factor for the development of multiple bone associated disorders, due to the highly vascularised structure of bone being exposed to systemic factors. However, the impact on bone to electronic cigarette (e-cigarette) use, which contains high doses of nicotine and other compounds including flavouring chemicals, metal particulates and carbonyls, is poorly understood. Here, we present the first evidence demonstrating the impact of e-cigarette vapour condensate (replicating changes in e-cigarette liquid chemical structure that occur upon device usage), on human primary osteoblast viability and function. 24 h exposure of osteoblasts to e-cigarette vapour condensate, generated from either second or third generation devices, significantly reduced osteoblast viability in a dose dependent manner, with condensate generated from the more powerful third generation device having greater toxicity. This effect was mediated in-part by nicotine, since exposure to nicotine-free condensate of an equal concentration had a less toxic effect. The detrimental effect of e-cigarette vapour condensate on osteoblast viability was rescued by co-treatment with the antioxidant N-Acetyl-L-cysteine (NAC), indicating toxicity may also be driven by reactive species generated upon device usage. Finally, non-toxic doses of either second or third generation condensate significantly blunted osteoblast osteoprotegerin secretion after 24 h, which was sustained for up to 7 days. In summary we demonstrate that e-cigarette vapour condensate, generated from commonly used second and third generation devices, can significantly reduce osteoblast viability and impair osteoblast function, at physiologically relevant doses. These data highlight the need for further investigation to inform users of the potential risks of e-cigarette use on bone health, including, accelerating bone associated disease progression, impacting skeletal development in younger users and to advise patients following orthopaedic surgery, dental surgery, or injury to maximise bone healing.
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Affiliation(s)
- Thomas Nicholson
- Institute of Inflammation and Ageing, MRC-ARUK Centre for Musculoskeletal Ageing Research, Institute of Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, UK
| | - Lauren Davis
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, UK
| | - Edward T. Davis
- Royal Orthopaedic Hospital, Bristol Road South, Birmingham B15 2TT, UK
| | | | - Aaron Scott
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, UK
| | - Simon W. Jones
- Institute of Inflammation and Ageing, MRC-ARUK Centre for Musculoskeletal Ageing Research, Institute of Inflammation and Ageing, University of Birmingham, Birmingham B15 2TT, UK
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29
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Vivarelli F, Granata S, Rullo L, Mussoni M, Candeletti S, Romualdi P, Fimognari C, Cruz-Chamorro I, Carrillo-Vico A, Paolini M, Canistro D. On the toxicity of e-cigarettes consumption: Focus on pathological cellular mechanisms. Pharmacol Res 2022; 182:106315. [PMID: 35724819 DOI: 10.1016/j.phrs.2022.106315] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 06/09/2022] [Accepted: 06/14/2022] [Indexed: 10/18/2022]
Abstract
Tobacco smoking remains without a doubt one of the leading causes of premature death worldwide. In combination with conventional protocols for smoking cessation, e-cigarettes have been proposed as a useful tool to quit smoking. Advertised as almost free of toxic effects, e-cigarettes have rapidly increased their popularity, becoming a sought-after device, especially among young people. Recently some health concerns about e-cigarette consumption are being raised. It is well known that they can release several toxic compounds, some of which are carcinogenic to humans, and emerging results are now outlining the risks related to the onset of respiratory and cardiovascular diseases and even cancer. The present review shows the emerging evidence about the role of technical components of the devices, the e-liquid composition as well as customization by consumers. The primary topics we discuss are the main toxicological aspects associated with e-cigarette consumption, focusing on the molecular pathways involved. Here it will be shown how exposure to e-cigarette aerosol induces stress/mitochondrial toxicity, DNA breaks/fragmentation following the same pathological pathways triggered by tobacco smoke, including the deregulation of molecular signalling axis associated with cancer progression and cell migration. Risk to fertility and pregnancy, as well as cardiovascular risk associated with e-cigarette use, have also been reported.
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Affiliation(s)
- Fabio Vivarelli
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy.
| | - Silvia Granata
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy; Department of Medicine and Surgery - University of Milano - Bicocca
| | - Laura Rullo
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy
| | - Matilde Mussoni
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy
| | - Sanzio Candeletti
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy
| | - Patrizia Romualdi
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy
| | - Carmela Fimognari
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, Italy
| | - Ivan Cruz-Chamorro
- Instituto de Biomedicina de Sevilla, IBiS (Universidad de Sevilla, HUVR, Junta de Andalucía, CSIC), 41013 Seville, Spain; Departamento de Bioquímica Médica y Biología Molecular e Inmunología, Universidad de Sevilla, 41009 Seville, Spain
| | - Antonio Carrillo-Vico
- Instituto de Biomedicina de Sevilla, IBiS (Universidad de Sevilla, HUVR, Junta de Andalucía, CSIC), 41013 Seville, Spain; Departamento de Bioquímica Médica y Biología Molecular e Inmunología, Universidad de Sevilla, 41009 Seville, Spain
| | - Moreno Paolini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy.
| | - Donatella Canistro
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Irnerio 48, 40126 Bologna, Italy
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30
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Jin XC, Wagner KA, Melvin MS, Smith DC, Pithawalla YB, Gardner WP, Avery KC, Karles GD. Influence of Nitrite on Formation of Tobacco-Specific Nitrosamines in Electronic Cigarette Liquids and Aerosols. Chem Res Toxicol 2022; 35:782-791. [PMID: 35417138 PMCID: PMC9115799 DOI: 10.1021/acs.chemrestox.1c00417] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Indexed: 11/28/2022]
Abstract
Tobacco-specific nitrosamine (TSNA) formation occurred during aerosol generation from select commercial cig-a-like e-cigarette products. To understand the drivers behind the potential formation of TSNAs in electronic cigarette (e-cigarette) aerosols and e-liquids, model e-liquid systems were generated in the lab to demonstrate that nitrite can react with nicotine and minor alkaloids to form TSNAs in e-liquids. In the presence of nitrite and nicotine, TSNA levels in e-liquids increased over time and the process was accelerated by elevated temperature. Additionally, TSNAs formed during aerosol generation when nitrite was present in the corresponding e-liquids. The commercial e-cigarette products that showed higher levels and formation of TSNAs were observed to contain nitrite and minor alkaloid impurities in the corresponding e-liquids. This study provides valuable information about drivers for TSNA formation in e-liquids and e-cigarette aerosols that may be applied to the evaluation and quality assurance of e-cigarette products.
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Affiliation(s)
- Xiaohong C. Jin
- Altria Client Services
LLC, Center for Research and Technology, 601 E Jackson Street, Richmond, Virginia 23219, United States
| | - Karl A. Wagner
- Altria Client Services
LLC, Center for Research and Technology, 601 E Jackson Street, Richmond, Virginia 23219, United States
| | - Matt S. Melvin
- Altria Client Services
LLC, Center for Research and Technology, 601 E Jackson Street, Richmond, Virginia 23219, United States
| | - Donna C. Smith
- Altria Client Services
LLC, Center for Research and Technology, 601 E Jackson Street, Richmond, Virginia 23219, United States
| | - Yezdi B. Pithawalla
- Altria Client Services
LLC, Center for Research and Technology, 601 E Jackson Street, Richmond, Virginia 23219, United States
| | - William P. Gardner
- Altria Client Services
LLC, Center for Research and Technology, 601 E Jackson Street, Richmond, Virginia 23219, United States
| | - Karen C. Avery
- Altria Client Services
LLC, Center for Research and Technology, 601 E Jackson Street, Richmond, Virginia 23219, United States
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31
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Canchola A, Meletz R, Khandakar RA, Woods M, Lin YH. Temperature dependence of emission product distribution from vaping of vitamin E acetate. PLoS One 2022; 17:e0265365. [PMID: 35324938 PMCID: PMC8947410 DOI: 10.1371/journal.pone.0265365] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 02/26/2022] [Indexed: 01/01/2023] Open
Abstract
Nearly two years after vitamin E acetate (VEA) was identified as the potential cause of the 2019–2020 outbreak of e-cigarette, or vaping product-associated lung injuries (EVALI), the toxicity mechanisms of VEA vaping are still yet to be fully understood. Studies since the outbreak have found that e-liquids such as VEA undergo thermal degradation during the vaping process to produce various degradation products, which may pose a greater risk of toxicity than exposure to unvaped VEA. Additionally, a wide range of customizable parameters–including the model of e-cigarette used, puffing topography, or the applied power/temperature used to generate aerosols–have been found to influence the physical properties and chemical compositions of vaping emissions. However, the impact of heating coil temperature on the chemical composition of VEA vaping emissions has not been fully assessed. In this study, we investigated the emission product distribution of VEA vaping emissions produced at temperatures ranging from 176 to 356°C, corresponding to a variable voltage vape pen set at 3.3 to 4.8V. VEA degradation was found to be greatly enhanced with increasing temperature, resulting in a shift towards the production of lower molecular weight compounds, such as the redox active duroquinone (DQ) and short-chain alkenes. Low temperature vaping of VEA resulted in the production of long-chain molecules, such as phytol, exposure to which has been suggested to induce lung damage in previous studies. Furthermore, differential product distribution was observed in VEA degradation products generated from vaping and from pyrolysis using a tube furnace in the absence of the heating coil at equivalent temperatures, suggesting the presence of external factors such as metals or oxidation that may enhance VEA degradation during vaping. Overall, our findings indicate that vaping behavior may significantly impact the risk of exposure to toxic vaping products and potential for vaping-related health concerns.
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Affiliation(s)
- Alexa Canchola
- Environmental Toxicology Graduate Program, University of California, Riverside, CA, United States of America
| | - Ruth Meletz
- Department of Environmental Sciences, University of California, Riverside, CA, United States of America
| | - Riste Ara Khandakar
- Department of Environmental Sciences, University of California, Riverside, CA, United States of America
| | - Megan Woods
- Department of Chemistry, University of California, Riverside, CA, United States of America
| | - Ying-Hsuan Lin
- Environmental Toxicology Graduate Program, University of California, Riverside, CA, United States of America
- Department of Environmental Sciences, University of California, Riverside, CA, United States of America
- * E-mail:
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Getiye Y, Peterson MR, Phillips BD, Carrillo D, Bisha B, He G. E-cigarette exposure with or without heating the e-liquid induces differential remodeling in the lungs and right heart of mice. J Mol Cell Cardiol 2022; 168:83-95. [PMID: 35489388 DOI: 10.1016/j.yjmcc.2022.04.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 04/18/2022] [Accepted: 04/23/2022] [Indexed: 01/12/2023]
Abstract
Various cardiopulmonary pathologies associated with electronic cigarette (EC) vaping have been reported. This study investigated the differential adverse effects of heating-associated by-products versus the intact components of EC aerosol to the lungs and heart of mice. We further dissected the roles of caspase recruitment domain-containing protein 9 (CARD9)-associated innate immune response and NOD-like receptor family pyrin domain containing 3 (NLRP3) inflammasome in EC exposure-induced cardiopulmonary injury. C57BL/6 wild type (WT), CARD9-/-, and NLRP3-/- mice were exposed to EC aerosol 3 h/day, 5 days/week for 6 month with or without heating the e-liquid with exposure to ambient air as the control. In WT mice, EC exposure with heating (EwH) significantly increased right ventricle (RV) free wall thickness at systole and diastole. However, EC exposure without heating (EwoH) caused a significant decrease in the wall thickness at systole. RV fractional shortening was also markedly reduced following EwH in WT and NLRP3-/- mice. Further, EwH activated NF-κB and p38 MAPK inflammatory signaling in the lungs, but not in the RV, in a CARD9- and NLRP3-dependent manner. Levels of circulatory inflammatory mediators were also elevated following EwH, indicating systemic inflammation. Moreover, EwoH activated TGF-β1/SMAD2/3/α-SMA fibrosis signaling in the lungs but not the RV of WT mice. In conclusion, EC aerosol exposure following EwH or EwoH induced differential cardiopulmonary remodeling and CARD9 innate immune and NLRP3 inflammasome contributed to the adverse effects.
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Affiliation(s)
- Yohannes Getiye
- School of Pharmacy, College of Health Sciences, University of Wyoming, Laramie, WY 82071, USA
| | - Matthew R Peterson
- School of Pharmacy, College of Health Sciences, University of Wyoming, Laramie, WY 82071, USA
| | - Brandon D Phillips
- School of Pharmacy, College of Health Sciences, University of Wyoming, Laramie, WY 82071, USA
| | - Daniel Carrillo
- School of Pharmacy, College of Health Sciences, University of Wyoming, Laramie, WY 82071, USA
| | - Bledar Bisha
- Department of Animal Science, University of Wyoming, Laramie, WY 82071, USA
| | - Guanglong He
- School of Pharmacy, College of Health Sciences, University of Wyoming, Laramie, WY 82071, USA.
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Marrocco A, Singh D, Christiani DC, Demokritou P. E-Cigarette (E-Cig) Liquid Composition and Operational Voltage Define the In Vitro Toxicity of Δ8Tetrahydrocannabinol/Vitamin E Acetate (Δ8THC/VEA) E-Cig Aerosols. Toxicol Sci 2022; 187:279-297. [PMID: 35478015 PMCID: PMC9154258 DOI: 10.1093/toxsci/kfac047] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The 2019 United States outbreak of E-cigarette (e-cig), or Vaping, Associated Acute Lung Injury (EVALI) has been linked to presence of vitamin E acetate (VEA) in Δ8tetrahydrocannabinol (Δ8THC)-containing e-liquids, as supported by VEA detection in patient biological samples. However, the pathogenesis of EVALI and the complex physicochemical properties of e-cig emissions remain unclear, raising concerns on health risks of vaping. This study investigates the effect of Δ8THC/VEA e-liquids and e-cig operational voltage on in vitro toxicity of e-cig aerosols. A novel E-cigExposure Generation System platform was used to generate and characterize e-cig aerosols from a panel of Δ8THC/VEA or nicotine-based e-liquids at 3.7 or 5 V. Human lung Calu-3 cells and THP-1 monocytes were exposed to cell culture media conditioned with collected e-cig aerosol condensate at doses of 85 and 257 puffs/m2 lung surface for 24 h, whereafter specific toxicological endpoints were assessed (including cytotoxicity, metabolic activity, reactive oxygen species generation, apoptosis, and inflammatory cytokines). Higher concentrations of gaseous volatile organic compounds were emitted from Δ8THC/VEA compared with nicotine-based e-liquids, especially at 5 V. Emitted PM2.5 concentrations in aerosol were higher for Δ8THC/VEA at 5 V and averagely for nicotine-based e-liquids at 3.7 V. Overall, aerosols from nicotine-based e-liquids showed higher bioactivity than Δ8THC/VEA aerosols in THP-1 cells, with no apparent differences in Calu-3 cells. Importantly, presence of VEA in Δ8THC and menthol flavoring in nicotine-based e-liquids increased cytotoxicity of aerosols across both cell lines, especially at 5 V. This study systematically investigates the physicochemical and toxicological properties of a model of Δ8THC/VEA and nicotine e-cigarette condensate exposure demonstrating that pyrolysis of these mixtures can generate hazardous toxicants whose synergistic actions potentially drive acute lung injury upon inhalation.
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Affiliation(s)
- Antonella Marrocco
- To whom correspondence should be addressed at Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, 665 Huntington Avenue, Building 1, Room 1310, Boston, MA 02115, USA. E-mail:
| | - Dilpreet Singh
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts 02115, USA
| | - David C Christiani
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts 02115, USA
| | - Philip Demokritou
- Department of Environmental Health, Center for Nanotechnology and Nanotoxicology, Harvard T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts 02115, USA,Department of Environmental and Population Health Bio-Sciences, Environmental Occupational Health Sciences Institute, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, USA
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34
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Sciuscio D, Calvino-Martin F, Kumar A, Langston TB, Martin E, Marescotti D, Mathis C, Hoeng J, Peitsch MC, Smith DC, Gogova M, Vanscheeuwijck P, Lee KM. Toxicological Assessment of Flavor Ingredients in E-Vapor Products. FRONTIERS IN TOXICOLOGY 2022; 4:878976. [PMID: 35516526 PMCID: PMC9065440 DOI: 10.3389/ftox.2022.878976] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 03/29/2022] [Indexed: 11/17/2022] Open
Abstract
Many flavor ingredients are often used in potentially reduced-risk tobacco products (such as e-vapor products). Although most are “generally recognized as safe (GRAS)” when used in food, there is limited information available on their long-term health effects when delivered by inhalation. While obtaining route-of-exposure-specific toxicological data on flavor ingredients is critical to product evaluation, the large number of individual flavor ingredients available and their potential combinations render classical toxicological assessment approaches impractical, as they may require years of preclinical investigations and thousands of laboratory animals. Therefore, we propose a pragmatic approach in which flavor ingredients are initially assigned to groups of structurally related compounds (Flavor Groups), from which flavor group representatives (FGR) are then selected and tested individually and as a mixture in vitro and in vivo. The premise is that structurally related compounds would have comparable metabolic and biological activity and that the data generated using FGRs could support the toxicological assessment of other structurally related flavor ingredients of their respective Flavor Groups. This approach is explained in a step-wise manner and exemplified by a case study, along with its strengths, limitations as well as recommendations for further confirmatory testing. Once completed, this FGR approach could significantly reduce the time and resources required for filling the data gap in understanding the health risks of many flavor ingredients while also minimizing the need for laboratory animals.
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Affiliation(s)
- Davide Sciuscio
- PMI R&D, Philip Morris Products S.A., Neuchâtel, Switzerland
- *Correspondence: Davide Sciuscio,
| | | | | | | | - Elyette Martin
- PMI R&D, Philip Morris Products S.A., Neuchâtel, Switzerland
| | | | - Carole Mathis
- PMI R&D, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Julia Hoeng
- PMI R&D, Philip Morris Products S.A., Neuchâtel, Switzerland
| | | | | | - Maria Gogova
- Altria Client Services LLC, Richmond, VA, United States
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Davis LC, Sapey E, Thickett DR, Scott A. Predicting the pulmonary effects of long-term e-cigarette use: are the clouds clearing? Eur Respir Rev 2022; 31:210121. [PMID: 35022257 PMCID: PMC9488959 DOI: 10.1183/16000617.0121-2021] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 09/16/2021] [Indexed: 12/15/2022] Open
Abstract
Commercially available since 2007, e-cigarettes are a popular electronic delivery device of ever-growing complexity. Given their increasing use by ex-smokers, smokers and never-smokers, it is important to evaluate evidence of their potential pulmonary effects and predict effects of long-term use, since there has been insufficient time to study a chronic user cohort. It is crucial to evaluate indicators of harm seen in cigarette use, and those potentially unique to e-cigarette exposure. Evaluation must also account for the vast variation in e-cigarette devices (now including at least five generations of devices) and exposure methods used in vivo and in vitroThus far, short-term use cohort studies, combined with in vivo and in vitro models, have been used to probe for the effects of e-cigarette exposure. The effects and mechanisms identified, including dysregulated inflammation and decreased pathogen resistance, show concerning overlaps with the established effects of cigarette smoke exposure. Additionally, research has identified a signature of dysregulated lipid processing, which is unique to e-cigarette exposure.This review will evaluate the evidence of pulmonary effects of, and driving mechanisms behind, e-cigarette exposure, which have been highlighted in emerging literature, and highlight the gaps in current knowledge. Such a summary allows understanding of the ongoing debate into e-cigarette regulation, as well as prediction and potential mitigation of future problems surrounding e-cigarette use.
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Affiliation(s)
- Lauren C Davis
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Elizabeth Sapey
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
- PIONEER, Health Data Research UK (HDRUK) Health Data Research Hub for Acute Care, Birmingham, UK
- Acute Medicine, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - David R Thickett
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
- Respiratory Medicine, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Aaron Scott
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
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36
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McGuigan M, Chapman G, Lewis E, Watson CH, Blount BC, Valentin-Blasini L. High-Performance Liquid Chromatography-Tandem Mass Spectrometry Analysis of Carbonyl Emissions from E-Cigarette, or Vaping, Products. ACS OMEGA 2022; 7:7655-7661. [PMID: 35284728 PMCID: PMC8908497 DOI: 10.1021/acsomega.1c06321] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 02/04/2022] [Indexed: 05/24/2023]
Abstract
A quantitative method was developed to measure four harmful carbonyls (acetaldehyde, acrolein, crotonaldehyde, and formaldehyde) in aerosol generated from e-cigarette, or vaping, products (EVPs). The method uses a commercially available sorbent bed treated with a derivatization solution to trap and stabilize reactive carbonyls in aerosol emissions from EVPs to reduce reactive analyte losses and improve quantification. Analytes were extracted from the sorbent material using acetonitrile and analyzed via high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The method was applied to aerosols generated from products obtained from case patients with EVP use-associated lung injury (EVALI). The method accuracy ranged from 93.6 to 105% in the solvent and 99.0 to 112% in the matrix. Limits of detection (LODs) were in the low nanogram range at 0.735-2.10 ng for all analytes, except formaldehyde at 14.7 ng. Intermediate precision, as determined from the replicate measurements of quality-control (QC) samples, showed a relative standard deviation (RSD) of less than 20% for all analytes. The EVALI case-related products delivered aerosol containing the following ranges of carbonyls: acetaldehyde (0.0856-5.59 μg), acrolein (0.00646-1.05 μg), crotonaldehyde (0.00168-0.108 μg), and formaldehyde (0.0533-12.6 μg). At least one carbonyl analyte was detected in every product. Carbonyl deliveries from EVALI-associated products of all types are consistent with the previously published results for e-cigarettes, and levels are lower than those observed in smoke from combustible cigarettes. This method is rugged, has high throughput, and is well suited for quantifying four harmful carbonyls in aerosol emissions produced by a broad spectrum of devices/solvents, ranging from e-cigarette containing polar solvents to vaping products containing nonpolar solvents.
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37
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Narimani M, Adams J, da Silva G. Toxic Chemical Formation during Vaping of Ethyl Ester Flavor Additives: A Chemical Kinetic Modeling Study. Chem Res Toxicol 2022; 35:522-528. [PMID: 35258279 DOI: 10.1021/acs.chemrestox.1c00437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ethyl ester flavor additives are used in e-liquids to produce a citrus flavor. Although these compounds are considered safe as flavor additives, this only applies to oral consumption and not vaping operations, where they can decompose into potentially harmful compounds including carboxylic acids. Further decomposition of these carboxylic acids is expected to produce ketene, which is a strong respiratory poison that can cause fatal lung damage at low concentrations. This study develops a kinetic model of the thermal decomposition of ethyl ester flavor additives and simulates the decomposition of these compounds under vaping conditions. These results show that under normal operating conditions, it is unlikely for any harmful compounds to be present in-lung. However, at higher operating temperatures, there is the potential for acetic and butanoic acid to be present in the lungs at concentrations that cause irritation, and where repeated exposure may lead to bronchitis. At more extreme operating conditions it is possible for harmful levels of ketene to be produced such that it could cause fatal or severely detrimental effects upon repeated exposure. These high temperatures can be reached under "dry" operating conditions that arise as a result of improper use, particularly in user-modified e-cigarettes.
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Affiliation(s)
- Milad Narimani
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Jamil Adams
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Gabriel da Silva
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3010, Australia
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38
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Lorkiewicz P, Keith R, Lynch J, Jin L, Theis W, Krivokhizhina T, Riggs D, Bhatnagar A, Srivastava S, Conklin DJ. Electronic Cigarette Solvents, JUUL E-Liquids, and Biomarkers of Exposure: In Vivo Evidence for Acrolein and Glycidol in E-Cig-Derived Aerosols. Chem Res Toxicol 2022; 35:283-292. [PMID: 35044764 PMCID: PMC8864610 DOI: 10.1021/acs.chemrestox.1c00328] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Despite the increasing popularity of e-cigarettes, their long-term health effects remain unknown. In animal models, exposure to e-cigarette has been reported to result in pulmonary and cardiovascular injury, and in humans, the acute use of e-cigarettes increases heart rate and blood pressure and induces endothelial dysfunction. In both animal models and humans, cardiovascular dysfunction associated with e-cigarettes has been linked to reactive aldehydes such as formaldehyde and acrolein generated in e-cigarette aerosols. These aldehydes are known products of heating and degradation of vegetable glycerin (VG) present in e-liquids. Here, we report that in mice, acute exposure to a mixture of propylene glycol:vegetable glycerin (PG:VG) or to e-cigarette-derived aerosols significantly increased the urinary excretion of acrolein and glycidol metabolites─3-hydroxypropylmercapturic acid (3HPMA) and 2,3-dihydroxypropylmercapturic acid (23HPMA)─as measured by UPLC-MS/MS. In humans, the use of e-cigarettes led to an increase in the urinary levels of 23HPMA but not 3HPMA. Acute exposure of mice to aerosols derived from PG:13C3-VG significantly increased the 13C3 enrichment of both urinary metabolites 13C3-3HPMA and 13C3-23HPMA. Our stable isotope tracing experiments provide further evidence that thermal decomposition of vegetable glycerin in the e-cigarette solvent leads to generation of acrolein and glycidol. This suggests that the adverse health effects of e-cigarettes may be attributable in part to these reactive compounds formed through the process of aerosolizing nicotine. Our findings also support the notion that 23HPMA, but not 3HPMA, may be a relatively specific biomarker of e-cigarette use.
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Affiliation(s)
- Pawel Lorkiewicz
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States,Department
of Chemistry, University of Louisville, Louisville, Kentucky 40202, United States
| | - Rachel Keith
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States,Division
of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, Kentucky 40202, United States
| | - Jordan Lynch
- Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States
| | - Lexiao Jin
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States
| | - Whitney Theis
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States
| | - Tatiana Krivokhizhina
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States
| | - Daniel Riggs
- Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States,Division
of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, Kentucky 40202, United States
| | - Aruni Bhatnagar
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States,Division
of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, Kentucky 40202, United States
| | - Sanjay Srivastava
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States,Division
of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, Kentucky 40202, United States
| | - Daniel J. Conklin
- American
Heart Association-Tobacco Regulation and Addiction Center, University of Louisville, Louisville, Kentucky 40202, United States,Christina
Lee Brown Envirome Institute, University
of Louisville, Louisville, Kentucky 40202, United States,Superfund
Research Center, University of Louisville, Louisville, Kentucky 40202, United States,Division
of Environmental Medicine, Department of Medicine, University of Louisville, Louisville, Kentucky 40202, United States,. Tel.: 502-852-5836
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Canchola A, Sabbir Ahmed C, Chen K, Chen JY, Lin YH. Formation of Redox-Active Duroquinone from Vaping of Vitamin E Acetate Contributes to Oxidative Lung Injury. Chem Res Toxicol 2022; 35:254-264. [PMID: 35077135 PMCID: PMC8860880 DOI: 10.1021/acs.chemrestox.1c00309] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In late 2019, the outbreak of e-cigarette or vaping-associated lung injuries (EVALIs) in the United States demonstrated to the public the potential health risks of vaping. While studies since the outbreak have identified vitamin E acetate (VEA), a diluent of tetrahydrocannabinol (THC) in vape cartridges, as a potential contributor to lung injuries, the molecular mechanisms through which VEA may cause damage are still unclear. Recent studies have found that the thermal degradation of e-liquids during vaping can result in the formation of products that are more toxic than the parent compounds. In this study, we assessed the role of duroquinone (DQ) in VEA vaping emissions that may act as a mechanism through which VEA vaping causes lung damage. VEA vaping emissions were collected and analyzed for their potential to generate reactive oxygen species (ROS) and induce oxidative stress-associated gene expression in human bronchial epithelial cells (BEAS-2B). Significant ROS generation by VEA vaping emissions was observed in both acellular and cellular systems. Furthermore, exposure to vaping emissions resulted in significant upregulation of NQO1 and HMOX-1 genes in BEAS-2B cells, indicating a strong potential for vaped VEA to cause oxidative damage and acute lung injury; the effects are more profound than exposure to equivalent concentrations of DQ alone. Our findings suggest that there may be synergistic interactions between thermal decomposition products of VEA, highlighting the multifaceted nature of vaping toxicity.
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Affiliation(s)
- Alexa Canchola
- Environmental Toxicology Graduate Program, University of California, Riverside, CA, USA
| | - C.M. Sabbir Ahmed
- Environmental Toxicology Graduate Program, University of California, Riverside, CA, USA
| | - Kunpeng Chen
- Department of Environmental Sciences, University of California, Riverside, CA, USA
| | - Jin Y. Chen
- Environmental Toxicology Graduate Program, University of California, Riverside, CA, USA
| | - Ying-Hsuan Lin
- Environmental Toxicology Graduate Program, University of California, Riverside, CA, USA,Department of Environmental Sciences, University of California, Riverside, CA, USA,Corresponding Author Ying-Hsuan Lin - Department of Environmental Sciences, University of California, Riverside, California 92521, United States; Environmental Toxicology Graduate Program, University of California, Riverside, California 92521, United States; Phone: +1-951-827-3785,
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40
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Effect of Heating on Physicochemical Property of Aerosols during Vaping. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19031892. [PMID: 35162914 PMCID: PMC8835267 DOI: 10.3390/ijerph19031892] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/29/2022] [Accepted: 02/02/2022] [Indexed: 11/17/2022]
Abstract
Many electronic cigarette manufacturers have offered different types of “high-end mods” that allow for controlled heating of the e-liquid. However, the controlled heating condition can drastically alter the inhaled aerosols’ physical properties and chemical substances, causing potential health risks. To investigate the contribution of heating on aerosol properties, we used four common power settings in the mods to conduct a physicochemical analysis. Our data showed that the aerosol mass and nicotine content in the aerosols increased at high power. Additionally, high power led to aerosolization of a viscous component in the e-liquid, increasing the viscosity of aerosol. However, the pH of the aerosol was constant regardless of the applied power. In addition, high-power operation made nicotine prone to oxidation, resulting in the color of the aerosol turning yellow. Lastly, we demonstrated that e-cigarette aerosol could contain various metals, including aluminum, arsenic, cadmium, chromium, copper, iron, magnesium, nickel, lead, and zinc. Even though these metal contents proportionally increased with the power setting, they remained far below the recommended exposure limits. Our finding demonstrates that the heating conditions of the e-cigarette change the physicochemical properties of the aerosols and their metal contents, thereby possibly affecting users’ oral and respiratory systems.
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41
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Platel A, Dusautoir R, Kervoaze G, Dourdin G, Gateau E, Talahari S, Huot L, Simar S, Ollivier A, Laine W, Kluza J, Gosset P, Garçon G, Anthérieu S, Guidice JML, Nesslany F. Comparison of the in vivo genotoxicity of electronic and conventional cigarettes aerosols after subacute, subchronic and chronic exposures. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127246. [PMID: 34844363 DOI: 10.1016/j.jhazmat.2021.127246] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 09/01/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
Tobacco smoking is classified as a human carcinogen. A wide variety of new products, in particular electronic cigarettes (e-cigs), have recently appeared on the market as an alternative to smoking. Although the in vitro toxicity of e-cigs is relatively well known, there is currently a lack of data on their long-term health effects. In this context, the aim of our study was to compare, on a mouse model and using a nose-only exposure system, the in vivo genotoxic and mutagenic potential of e-cig aerosols tested at two power settings (18 W and 30 W) and conventional cigarette (3R4F) smoke. The standard comet assay, micronucleus test and Pig-a gene mutation assay were performed after subacute (4 days), subchronic (3 months) and chronic (6 months) exposure. The generation of oxidative stress was also assessed by measuring the 8-hydroxy-2'-deoxyguanosine and by using the hOGG1-modified comet assay. Our results show that only the high-power e-cig and the 3R4F cigarette induced oxidative DNA damage in the lung and the liver of exposed mice. In return, no significant increase in chromosomal aberrations or gene mutations were noted whatever the type of product. This study demonstrates that e-cigs, at high-power setting, should be considered, contrary to popular belief, as hazardous products in terms of genotoxicity in mouse model.
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Affiliation(s)
- Anne Platel
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Romain Dusautoir
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Gwenola Kervoaze
- University of Lille, CNRS UMR9017, Inserm U1019, CHRU Lille, Institut Pasteur de Lille, CIIL - Center for Infection and Immunity of Lille, OpInfIELD, France.
| | - Gonzague Dourdin
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Eulalie Gateau
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Smaïl Talahari
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Ludovic Huot
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Sophie Simar
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Anaïs Ollivier
- University of Lille, CNRS UMR9017, Inserm U1019, CHRU Lille, Institut Pasteur de Lille, CIIL - Center for Infection and Immunity of Lille, OpInfIELD, France.
| | - William Laine
- UMR 9020-UMR-S 1277-Canther-Cancer Heterogeneity, Plasticity and Resistance to Therapies, Institut de Recherche contre le Cancer de Lille, University Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France.
| | - Jérôme Kluza
- UMR 9020-UMR-S 1277-Canther-Cancer Heterogeneity, Plasticity and Resistance to Therapies, Institut de Recherche contre le Cancer de Lille, University Lille, CNRS, Inserm, CHU Lille, F-59000 Lille, France.
| | - Philippe Gosset
- University of Lille, CNRS UMR9017, Inserm U1019, CHRU Lille, Institut Pasteur de Lille, CIIL - Center for Infection and Immunity of Lille, OpInfIELD, France.
| | - Guillaume Garçon
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Sébastien Anthérieu
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Jean-Marc Lo Guidice
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
| | - Fabrice Nesslany
- CHU Lille, Institut Pasteur de Lille, ULR 4483-IMPact de l'Environnement Chimique sur la Santé (IMPECS), Univ. Lille, Lille, France.
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Tang MS, Lee HW, Weng MW, Wang HT, Hu Y, Chen LC, Park SH, Chan HW, Xu J, Wu XR, Wang H, Yang R, Galdane K, Jackson K, Chu A, Halzack E. DNA damage, DNA repair and carcinogenicity: Tobacco smoke versus electronic cigarette aerosol. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2022; 789:108409. [PMID: 35690412 PMCID: PMC9208310 DOI: 10.1016/j.mrrev.2021.108409] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 12/06/2021] [Accepted: 12/13/2021] [Indexed: 01/03/2023]
Abstract
The allure of tobacco smoking is linked to the instant gratification provided by inhaled nicotine. Unfortunately, tobacco curing and burning generates many mutagens including more than 70 carcinogens. There are two types of mutagens and carcinogens in tobacco smoke (TS): direct DNA damaging carcinogens and procarcinogens, which require metabolic activation to become DNA damaging. Recent studies provide three new insights on TS-induced DNA damage. First, two major types of TS DNA damage are induced by direct carcinogen aldehydes, cyclic-1,N2-hydroxy-deoxyguanosine (γ-OH-PdG) and α-methyl-1, N2-γ-OH-PdG, rather than by the procarcinogens, polycyclic aromatic hydrocarbons and aromatic amines. Second, TS reduces DNA repair proteins and activity levels. TS aldehydes also prevent procarcinogen activation. Based on these findings, we propose that aldehydes are major sources of TS induce DNA damage and a driving force for carcinogenesis. E-cigarettes (E-cigs) are designed to deliver nicotine in an aerosol state, without burning tobacco. E-cigarette aerosols (ECAs) contain nicotine, propylene glycol and vegetable glycerin. ECAs induce O6-methyl-deoxyguanosines (O6-medG) and cyclic γ-hydroxy-1,N2--propano-dG (γ-OH-PdG) in mouse lung, heart and bladder tissues and causes a reduction of DNA repair proteins and activity in lungs. Nicotine and nicotine-derived nitrosamine ketone (NNK) induce the same types of DNA adducts and cause DNA repair inhibition in human cells. After long-term exposure, ECAs induce lung adenocarcinoma and bladder urothelial hyperplasia in mice. We propose that E-cig nicotine can be nitrosated in mouse and human cells becoming nitrosamines, thereby causing two carcinogenic effects, induction of DNA damage and inhibition of DNA repair, and that ECA is carcinogenic in mice. Thus, this article reviews the newest literature on DNA adducts and DNA repair inhibition induced by nicotine and ECAs in mice and cultured human cells, and provides insights into ECA carcinogenicity in mice.
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Affiliation(s)
- Moon-Shong Tang
- Department of Environmental Medicine, Pathology and Medicine, United States.
| | - Hyun-Wook Lee
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Mao-Wen Weng
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Hsiang-Tsui Wang
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Yu Hu
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Lung-Chi Chen
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Sung-Hyun Park
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Huei-Wei Chan
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Jiheng Xu
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Xue-Ru Wu
- Departmemt of Urology, New York University School of Medicine, New York, NY10016, United States
| | - He Wang
- Department of Pathology and Laboratory Medicine, Robert Wood Johnson MedicalSchool, Rutgers University, Piscataway, NJ 08854, United States
| | - Rui Yang
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Karen Galdane
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Kathryn Jackson
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Annie Chu
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Elizabeth Halzack
- Department of Environmental Medicine, Pathology and Medicine, United States
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Palazzolo DL, Caudill J, Baron J, Cooper K. Fabrication and Validation of an Economical, Programmable, Dual-Channel, Electronic Cigarette Aerosol Generator. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182413190. [PMID: 34948804 PMCID: PMC8703563 DOI: 10.3390/ijerph182413190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/06/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022]
Abstract
Vaping (inhalation of electronic cigarette-generated aerosol) is a public health concern. Due to recent spikes in adolescent use of electronic cigarettes (ECIGs) and vaping-induced illnesses, demand for scientific inquiry into the physiological effects of electronic cigarette (ECIG) aerosol has increased. For such studies, standardized and consistent aerosol production is required. Many labs generate aerosol by manually activating peristaltic pumps and ECIG devices simultaneously in a predefined manner. The tedium involved with this process (large puff number over time) and risk of error in keeping with puff topography (puff number, duration, interval) are less than optimal. Furthermore, excess puffing on an ECIG device results in battery depletion, reducing aerosol production, and ultimately, its chemical and physical nature. While commercial vaping machines are available, the cost of these machines is prohibitive to many labs. For these reasons, an economical and programmable ECIG aerosol generator, capable of generating aerosol from two atomizers simultaneously, was fabricated, and subsequently validated. Validation determinants include measurements of atomizer temperatures (inside and outside), electrical parameters (current, resistance and power) of the circuitry, aerosol particle distribution (particle counts and mass concentrations) and aerosol delivery (indexed by nicotine recovery), all during stressed conditions of four puffs/minute for 75 min (i.e., 300 puffs). Validation results indicate that the ECIG aerosol generator is better suited for experiments involving ≤100 puffs. Over 100 puffs, the amount of variation in the parameters measured tends to increase. Variations between channels are generally higher than variations within a channel. Despite significant variations in temperatures, electrical parameters, and aerosol particle distributions, both within and between channels, aerosol delivery remains remarkably stable for up to 300 puffs, yielding over 25% nicotine recovery for both channels. In conclusion, this programmable, dual-channel ECIG aerosol generator is not only affordable, but also allows the user to control puff topography and eliminate battery drain of ECIG devices. Consequently, this aerosol generator is valid, reliable, economical, capable of using a variety of E-liquids and amenable for use in a vast number of studies investigating the effects of ECIG-generated aerosol while utilizing a multitude of puffing regimens in a standardized manner.
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Affiliation(s)
- Dominic L. Palazzolo
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
- Correspondence:
| | - Jordan Caudill
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
| | - James Baron
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
| | - Kevin Cooper
- Department of Chemistry and Physics, School of Mathematics & Sciences, Lincoln Memorial University, Harrogate, TN 37752, USA;
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Carbonyl Composition and Electrophilicity in Vaping Emissions of Flavored and Unflavored E-Liquids. TOXICS 2021; 9:toxics9120345. [PMID: 34941780 PMCID: PMC8705255 DOI: 10.3390/toxics9120345] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 11/13/2021] [Accepted: 12/06/2021] [Indexed: 11/16/2022]
Abstract
It has been demonstrated that propylene glycol (PG), vegetable glycerin (VG), and flavoring chemicals can thermally degrade to form carbonyls during vaping, but less is known about carbonyl emissions produced by transformation of flavoring chemicals and the interactive effects among e-liquid constituents. This study characterized carbonyl composition and levels in vaping emissions of PG-VG (e-liquid base solvents) and four e-liquid formulations flavored with trans-2-hexenol, benzyl alcohol, l-(-)-menthol, or linalool. Utilizing gas chromatography (GC)- and liquid chromatography (LC)-mass spectrometry (MS) methods, 14 carbonyls were identified and quantified. PG-VG emitted highest levels of formaldehyde, acetaldehyde, and acrolein. However, flavored e-liquids contributed to the production of a wider variety of carbonyls, with some carbonyls directly corresponding to the oxidation of alcohol moieties in flavoring compounds (e.g., trans-2-hexenol and benzyl alcohol transformed into trans-2-hexenal and benzaldehyde, respectively). Detections of formaldehyde-GSH and trans-2-hexenal-GSH adducts signify interactions of carbonyls with biological nucleophiles. The global reactivity descriptors (I, A, μ, η, and ω) and condensed Fukui parameters (fk0, fk-, fk+, and dual-descriptor) were computed to elucidate site reactivities of selected simple and α,β-unsaturated carbonyls found in vaping emissions. Overall, this study highlights carbonyl emissions and reactivities and their potential health risk effects associated with vaping.
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Son Y, Khlystov A. An Automated Aerosol Collection and Extraction System to Characterize Electronic Cigarette Aerosols. Front Chem 2021; 9:764730. [PMID: 34805094 PMCID: PMC8600130 DOI: 10.3389/fchem.2021.764730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 09/29/2021] [Indexed: 11/13/2022] Open
Abstract
Electronic cigarette (e-cigarette) market increased by 122% during 2014–2020 and is expected to continue growing rapidly. Despite their popularity, e-cigarettes are known to emit dangerous levels of toxic compounds (e.g., carbonyls), but a lack of accurate and efficient testing methods is hindering the characterization of e-cigarette aerosols emitted by a wide variety of e-cigarette devices, e-liquids, and use patterns. The aim of this study is to fill this gap by developing an automated E-cigarette Aerosol Collection and Extraction System (E-ACES) consisting of a vaping machine and a collection/extraction system. The puffing system was designed to mimic e-cigarette use patterns (i.e., power output and puff topography) by means of a variable power-supply and a flow control system. The sampling system collects e-cigarette aerosols using a combination of glass wool and a continuously wetted denuder. After the collection stage, the system is automatically washed with absorbing and extracting liquids (e.g., methanol, an acetaldehyde-DNPH solution). The entire system is controlled by a computer. E-ACES performance was evaluated against conventional methods during measurements of nicotine and carbonyl emissions from a tank type e-cigarette. Nicotine levels measured using glass fiber filters and E-ACES were not significantly different: 201.2 ± 6.2 and 212.5 ± 17 μg/puff (p = 0.377), respectively. Differences in formaldehyde and acetaldehyde levels between filter-DNPH cartridges and the E-ACES were 14% (p = 0.057) and 13% (p = 0.380), respectively. The E-ACES showed reproducible nicotine and carbonyl testing results for the selected e-cigarette vaping conditions.
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Affiliation(s)
- Yeongkwon Son
- Organic Analytical Laboratory, Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States
| | - Andrey Khlystov
- Organic Analytical Laboratory, Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States
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Snoderly HT, Nurkiewicz TR, Bowdridge EC, Bennewitz MF. E-Cigarette Use: Device Market, Study Design, and Emerging Evidence of Biological Consequences. Int J Mol Sci 2021; 22:12452. [PMID: 34830344 PMCID: PMC8619996 DOI: 10.3390/ijms222212452] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/12/2021] [Accepted: 11/16/2021] [Indexed: 12/12/2022] Open
Abstract
Electronic cigarettes are frequently viewed as a safer alternative to conventional cigarettes; however, evidence to support this perspective has not materialized. Indeed, the current literature reports that electronic cigarette use is associated with both acute lung injury and subclinical dysfunction to the lung and vasculature that may result in pathology following chronic use. E-cigarettes can alter vascular dynamics, polarize innate immune populations towards a proinflammatory state, compromise barrier function in the pulmonary endothelium and epithelium, and promote pre-oncogenic phenomena. This review will summarize the variety of e-cigarette products available to users, discuss current challenges in e-cigarette study design, outline the range of pathologies occurring in cases of e-cigarette associated acute lung injury, highlight disease supporting tissue- and cellular-level changes resulting from e-cigarette exposure, and briefly examine how these changes may promote tumorigenesis. Continued research of the mechanisms by which e-cigarettes induce pathology benefit users and clinicians by resulting in increased regulation of vaping devices, informing treatments for emerging diseases e-cigarettes produce, and increasing public awareness to reduce e-cigarette use and the onset of preventable disease.
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Affiliation(s)
- Hunter T. Snoderly
- Department of Chemical and Biomedical Engineering, Benjamin M. Statler College of Engineering and Mineral Resources, West Virginia University, Morgantown, WV 26506, USA;
- Center for Inhalation Toxicology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA; (T.R.N.); (E.C.B.)
| | - Timothy R. Nurkiewicz
- Center for Inhalation Toxicology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA; (T.R.N.); (E.C.B.)
- Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| | - Elizabeth C. Bowdridge
- Center for Inhalation Toxicology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA; (T.R.N.); (E.C.B.)
- Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA
| | - Margaret F. Bennewitz
- Department of Chemical and Biomedical Engineering, Benjamin M. Statler College of Engineering and Mineral Resources, West Virginia University, Morgantown, WV 26506, USA;
- Center for Inhalation Toxicology, School of Medicine, West Virginia University, Morgantown, WV 26506, USA; (T.R.N.); (E.C.B.)
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Holt AK, Poklis JL, Peace MR. A Retrospective Analysis of Chemical Constituents in Regulated and Unregulated E-Cigarette Liquids. Front Chem 2021; 9:752342. [PMID: 34778207 PMCID: PMC8581558 DOI: 10.3389/fchem.2021.752342] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 09/27/2021] [Indexed: 01/26/2023] Open
Abstract
E-cigarette or vaping use-associated lung injury (EVALI) was identified with the incidents of a multi-state outbreak of acute lung injuries associated with the use of electronic cigarettes (e-cigs) and attributed to vitamin E acetate in off-market cannabis-based e-liquids. Aside from EVALI, hypersecretion of mucus, irritated nasal passages, and watery, red eyes have been defined as complaints associated with vaping standard nicotine-based e-liquids. The chemical composition of e-liquids varies between manufacturers and robust oversight of ingredients is lacking. Manufacturers use chemicals deemed "generally recognized as safe" (GRAS) by the FDA, a designation for chemicals used in foodstuffs to be ingested. Most "GRAS" chemicals are associated with at least one Global Harmonization System (GHS) warning class, ranging from irritant to toxic. Untargeted chemical analysis is critical to evaluate e-liquid products to determine chemical composition; equally important is the quantitation of components to help elucidate the potential harms from exceeding recommended exposure limits. Untargeted screening of e-liquids was accomplished using gas chromatography-mass spectrometry (GC-MS) and Direct Analysis in Real Time-AccuTOF™ mass spectrometry (DART-ToF-MS) and has identified 350 chemical constituents from 241 products analyzed. Nicotine, caffeine, menthol, and vitamin E were confirmed and quantitated by GC-MS, ethanol was confirmed and quantitated by headspace-gas chromatography-dual flame ionization detection (HS-GC-FID), and olivetol and cannabinoids were confirmed and quantitated by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Maximum identified concentrations of nicotine, caffeine, menthol, vitamin E, ethanol, olivetol, Δ9-tetrahydrocannabinol, and cannabidiol were 56.4, 26.9, 4.28, 307.9, 217.2, 399.6, 497.7, and 332.6 mg/ml, respectively. Evaluation of untargeted analysis and quantitation of unlabeled chemical components of e-liquids is essential to improving etiology of acute lung injury and less severe impacts of vaping, both short-term and long-term. The historical documentation of unlabeled ingredients can provide some insight for a retrospective analysis of health consequences and inform policy discussions.
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Affiliation(s)
- Alaina K. Holt
- Department of Forensic Science, Virginia Commonwealth University, Richmond, VA, United States,Integrative Life Sciences Doctoral Program, Virginia Commonwealth University, Richmond, VA, United States
| | - Justin L. Poklis
- Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA, United States
| | - Michelle R. Peace
- Department of Forensic Science, Virginia Commonwealth University, Richmond, VA, United States,*Correspondence: Michelle R. Peace,
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McAdam K, Waters G, Moldoveanu S, Margham J, Cunningham A, Vas C, Porter A, Digard H. Diacetyl and Other Ketones in e-Cigarette Aerosols: Some Important Sources and Contributing Factors. Front Chem 2021; 9:742538. [PMID: 34631664 PMCID: PMC8495241 DOI: 10.3389/fchem.2021.742538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 09/03/2021] [Indexed: 11/23/2022] Open
Abstract
Background: Concerns over the presence of the diketones 2,4 butanedione (DA) and 2,3 pentanedione (AP) in e-cigarettes arise from their potential to cause respiratory diseases. Their presence in e-liquids is a primary source, but they may potentially be generated by glycerol (VG) and propylene glycol (PG) when heated to produce aerosols. Factors leading to the presence of AP, DA and acetoin (AC) in e-cigarette aerosols were investigated. We quantified direct transfer from e-liquids, examined thermal degradation of major e-liquid constituents VG, PG and 1,3 propanediol (1,3 PD) and the potential for AC, AP and DA production from sugars and flavor additives when heated in e-cigarettes. Method: Transfers of AC, AP and DA from e-liquids to e-cigarette aerosols were quantified by comparing aerosol concentrations to e-liquid concentrations. Thermal generation from VG, PG or 1,3 PD e-liquids was investigated by measuring AC, AP and DA emissions as a function of temperature in an e-cigarette. Thermal generation of AC, AP and DA from sugars was examined by aerosolising e-liquids containing sucrose, fructose or glucose in an e-cigarette. Pyrolytic formation of AP and DA from a range of common flavors was assessed using flash pyrolysis techniques. Results: AC transfer efficiency was >90%, while AP and DA were transferred less efficiently (65%) indicating losses during aerosolisation. Quantifiable levels of DA were generated from VG and PG, and to a lesser extent 1,3 PD at coil temperatures >300°C. Above 350°C AP was generated from VG and 1,3 PD but not PG. AC was not generated from major constituents, although low levels were generated by thermal reduction of DA. Aerosols from e-liquids containing sucrose contained quantifiable (>6 ng/puff) levels of DA at all sucrose concentrations tested, with DA emissions increasing with increasing device power and concentration. 1% glucose, fructose or sucrose e-liquids gave comparable DA emissions. Furanose ring compounds also generate DA and AP when heated to 250°C. Conclusions: In addition to less than quantitative direct transfer from the e-liquid, DA and AP can be present in the e-cigarette aerosol due to thermal decomposition reactions of glycols, sugars and furanonse ring flavors under e-cigarette operating conditions.
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Affiliation(s)
- Kevin McAdam
- McAdam Scientific Ltd., Eastleigh, United Kingdom
| | - Gareth Waters
- Research and Development, British American Tobacco, Southampton, United Kingdom
| | | | - Jennifer Margham
- Research and Development, British American Tobacco, Southampton, United Kingdom
| | - Anthony Cunningham
- Research and Development, British American Tobacco, Southampton, United Kingdom
| | - Carl Vas
- Longwell Green, Bristol, United Kingdom
| | | | - Helena Digard
- Research and Development, British American Tobacco, Southampton, United Kingdom
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Targeted Characterization of the Chemical Composition of JUUL Systems Aerosol and Comparison with 3R4F Reference Cigarettes and IQOS Heat Sticks. SEPARATIONS 2021. [DOI: 10.3390/separations8100168] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Aerosol constituent yields have been reported from a wide range of electronic nicotine delivery systems. No comprehensive study has been published on the aerosol constituents generated from the JUUL system. Targeted analyses of 53 aerosol constituents from the four JUUL products currently on the US market (Virginia Tobacco and Menthol flavored e-liquids in both 5.0% and 3.0% nicotine concentration by weight) was performed using non-intense and intense puffing regimens. All measurements were conducted by an ISO 17025 accredited contract research organization. JUUL product aerosol constituents were compared to published values for the 3R4F research cigarette and IQOS Regular and Menthol heated tobacco products. Across the four JUUL products and two puffing regimes, only 10/53 analytes were quantifiable, including only two carbonyls (known propylene glycol or glycerol degradants). The remaining analytes were primary ingredients, nicotine degradants and water. Average analyte reductions (excluding primary ingredients and water) for all four JUUL system aerosols tested were greater than 98% lower than 3R4F mainstream smoke, and greater than 88% lower than IQOS aerosol. In summary, chemical characterization and evaluation of JUUL product aerosols demonstrates a significant reduction in toxicants when compared to mainstream cigarette smoke from 3R4F reference cigarettes or aerosols from IQOS-heated tobacco products.
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Determination of Formaldehyde Yields in E-Cigarette Aerosols: An Evaluation of the Efficiency of the DNPH Derivatization Method. SEPARATIONS 2021. [DOI: 10.3390/separations8090151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Recent reports have suggested that (1) formaldehyde levels (measured as a hydrazone derivative using the DNPH derivatization method) in Electronic Nicotine Delivery Systems (ENDS) products were underreported because formaldehyde may react with propylene glycol (PG) and glycerin (Gly) in the aerosol to form hemiacetals; (2) the equilibrium would shift from the hemiacetals to the acetals in the acidic DNPH trapping solution. In both cases, neither the hemiacetal nor the acetal would react with DNPH to form the target formaldehyde hydrazone, due to the lack of the carbonyl functional group, thus underreporting formaldehyde. These reports were studied in our laboratory. Our results showed that the aerosol generated from formaldehyde-fortified e-liquids provided a near-quantitative recovery of formaldehyde in the aerosol, suggesting that if any hemiacetal was formed in the aerosol, it would readily hydrolyze to free formaldehyde and, consequently, form formaldehyde hydrazone in the acidic DNPH trapping solution. We demonstrated that custom-synthesized Gly and PG hemiacetal adducts added to the DNPH trapping solution would readily hydrolyze to form the formaldehyde hydrazone. We demonstrated that acetals of PG and Gly present in e-liquid are almost completely transferred to the aerosol during aerosolization. The study results demonstrate that the DNPH derivatization method allows for an accurate measurement of formaldehyde in vapor products.
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