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Taktikakis P, Côté M, Subramaniam N, Kroeger K, Youssef H, Badia A, DeWolf C. Understanding the Retention of Vaping Additives in the Lungs: Model Lung Surfactant Membrane Perturbation by Vitamin E and Vitamin E Acetate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5651-5662. [PMID: 38437623 DOI: 10.1021/acs.langmuir.3c02952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Deviations from the normal physicochemical and functional properties of pulmonary surfactants are associated with the incidence of lung injury and other respiratory disorders. This study aims to evaluate the alteration of the 2D molecular organization and morphology of pulmonary surfactant model membranes by the electronic cigarette additives α-tocopherol (vitamin E) and α-tocopherol acetate (vitamin E acetate), which have been associated with lung injury, termed e-cigarette or vaping-use-associated lung injury (EVALI). The model membranes used contained a 7:3 molar ratio of DPPC (1,2-dipalmitoyl-sn-glycero-3-phosphocholine) and POPG (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol) to which α-tocopherol and α-tocopherol acetate were added to form mixtures of up to 20 mol % additive. The properties of the neat tocopherol additives and DPPC/POPG (7:3) mixtures with increasing molar proportions of additive were evaluated by surface pressure-area isotherms, excess area calculations, Brewster angle microscopy, grazing incidence X-ray diffraction, X-ray reflectivity, and atomic force microscopy. The addition of either additive alters the essential phase balance of the model pulmonary surfactant membrane by generating a greater proportion of the fluid phase. Despite this net fluidization, both tocopherol additives have space-filling effects on the liquid-expanded and condensed phases, yielding negative excess areas in the liquid-expanded phase and reduced tilt angles in the condensed phase. Both tocopherol additives alter the stability of the fluid phase, pushing the eventual collapse of this phase to higher surface pressures than the model membrane in the absence of an additive.
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Affiliation(s)
- Panagiota Taktikakis
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University, 7141 Sherbrooke St. W., Montréal, Quebec H4B 1R6, Canada
- FRQNT Quebec Centre for Advanced Materials, 2101, rue Jeanne-Mance, Montréal, Quebec H2X 2J6, Canada
| | - Mathieu Côté
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University, 7141 Sherbrooke St. W., Montréal, Quebec H4B 1R6, Canada
- FRQNT Quebec Centre for Advanced Materials, 2101, rue Jeanne-Mance, Montréal, Quebec H2X 2J6, Canada
| | - Nivetha Subramaniam
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University, 7141 Sherbrooke St. W., Montréal, Quebec H4B 1R6, Canada
- FRQNT Quebec Centre for Advanced Materials, 2101, rue Jeanne-Mance, Montréal, Quebec H2X 2J6, Canada
| | - Kailen Kroeger
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University, 7141 Sherbrooke St. W., Montréal, Quebec H4B 1R6, Canada
- FRQNT Quebec Centre for Advanced Materials, 2101, rue Jeanne-Mance, Montréal, Quebec H2X 2J6, Canada
| | - Hala Youssef
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University, 7141 Sherbrooke St. W., Montréal, Quebec H4B 1R6, Canada
- FRQNT Quebec Centre for Advanced Materials, 2101, rue Jeanne-Mance, Montréal, Quebec H2X 2J6, Canada
| | - Antonella Badia
- Département de chimie and Institut Courtois, Université de Montréal, Complexe des sciences, C.P. 6128, succursale Centre-ville, Montréal, Quebec H3C 3J7, Canada
- FRQNT Quebec Centre for Advanced Materials, 2101, rue Jeanne-Mance, Montréal, Quebec H2X 2J6, Canada
| | - Christine DeWolf
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University, 7141 Sherbrooke St. W., Montréal, Quebec H4B 1R6, Canada
- FRQNT Quebec Centre for Advanced Materials, 2101, rue Jeanne-Mance, Montréal, Quebec H2X 2J6, Canada
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Warren KJ, Beck EM, Callahan SJ, Helms MN, Middleton E, Maddock S, Carr JR, Harris D, Blagev DP, Lanspa MJ, Brown SM, Paine R. Alveolar macrophages from EVALI patients and e-cigarette users: a story of shifting phenotype. Respir Res 2023; 24:162. [PMID: 37330506 PMCID: PMC10276465 DOI: 10.1186/s12931-023-02455-w] [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: 11/17/2022] [Accepted: 05/19/2023] [Indexed: 06/19/2023] Open
Abstract
Exposure to e-cigarette vapors alters important biologic processes including phagocytosis, lipid metabolism, and cytokine activity in the airways and alveolar spaces. Little is known about the biologic mechanisms underpinning the conversion to e-cigarette, or vaping, product use-associated lung injury (EVALI) from normal e-cigarette use in otherwise healthy individuals. We compared cell populations and inflammatory immune populations from bronchoalveolar lavage fluid in individuals with EVALI to e-cigarette users without respiratory disease and healthy controls and found that e-cigarette users with EVALI demonstrate a neutrophilic inflammation with alveolar macrophages skewed towards inflammatory (M1) phenotype and cytokine profile. Comparatively, e-cigarette users without EVALI demonstrate lower inflammatory cytokine production and express features associated with a reparative (M2) phenotype. These data indicate macrophage-specific changes are occurring in e-cigarette users who develop EVALI.
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Affiliation(s)
- Kristi J Warren
- Department of Internal Medicine, Division of Pulmonary & Critical Care Medicine, University of Utah, Salt Lake City, UT, 84132, USA.
- George E. Wahlen VA Medical Center, 500 Foothill Dr, Salt Lake City, UT, 84148, USA.
| | - Emily M Beck
- Department of Internal Medicine, Division of Pulmonary & Critical Care Medicine, University of Utah, Salt Lake City, UT, 84132, USA
- George E. Wahlen VA Medical Center, 500 Foothill Dr, Salt Lake City, UT, 84148, USA
| | - Sean J Callahan
- Department of Internal Medicine, Division of Pulmonary & Critical Care Medicine, University of Utah, Salt Lake City, UT, 84132, USA
- George E. Wahlen VA Medical Center, 500 Foothill Dr, Salt Lake City, UT, 84148, USA
| | - My N Helms
- Department of Internal Medicine, Division of Pulmonary & Critical Care Medicine, University of Utah, Salt Lake City, UT, 84132, USA
| | - Elizabeth Middleton
- Department of Internal Medicine, Division of Pulmonary & Critical Care Medicine, University of Utah, Salt Lake City, UT, 84132, USA
| | - Sean Maddock
- George E. Wahlen VA Medical Center, 500 Foothill Dr, Salt Lake City, UT, 84148, USA
- Division of Pulmonary and Critical Care Medicine, National Jewish Health, Denver, CO, 80206, USA
| | - Jason R Carr
- Department of Internal Medicine, Division of Pulmonary & Critical Care Medicine, University of Utah, Salt Lake City, UT, 84132, USA
- Intermountain Healthcare, Department of Pulmonary & Critical Care Medicine, Murray, UT, 84107, USA
| | - Dixie Harris
- Intermountain Healthcare, Department of Pulmonary & Critical Care Medicine, Murray, UT, 84107, USA
| | - Denitza P Blagev
- Intermountain Healthcare, Department of Pulmonary & Critical Care Medicine, Murray, UT, 84107, USA
| | - Michael J Lanspa
- Intermountain Healthcare, Department of Pulmonary & Critical Care Medicine, Murray, UT, 84107, USA
| | - Samuel M Brown
- Intermountain Healthcare, Department of Pulmonary & Critical Care Medicine, Murray, UT, 84107, USA
| | - Robert Paine
- Department of Internal Medicine, Division of Pulmonary & Critical Care Medicine, University of Utah, Salt Lake City, UT, 84132, USA
- George E. Wahlen VA Medical Center, 500 Foothill Dr, Salt Lake City, UT, 84148, USA
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Rivera-Garcia MT, Rose RM, Wilson-Poe AR. High-CBD Cannabis Vapor Attenuates Opioid Reward and Partially Modulates Nociception in Female Rats. ADDICTION NEUROSCIENCE 2023; 5:100050. [PMID: 36937502 PMCID: PMC10019487 DOI: 10.1016/j.addicn.2022.100050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Chronic pain patients report analgesic effects when using cannabidiol (CBD), a phytocannabinoid found in whole-plant cannabis extract (WPE). Several studies suggest that cannabis-derived products may serve as an analgesic adjunct or alternative to opioids, and importantly, CBD may also attenuate the abuse potential of opioids. Vaping is a popular route of administration among people who use cannabis, however both the therapeutic and hazardous effects of vaping are poorly characterized. Despite the fact that chronic pain is more prevalent in women, the ability of inhaled high-CBD WPE to relieve pain and reduce opioid reward has not been studied in females. Here, we present a comprehensive analysis of high-CBD WPE vapor inhalation in female rats. We found that WPE was modestly efficacious in reversing neuropathy-induced cold allodynia in rats with spared nerve injury (SNI). Chronic exposure to WPE did not affect lung cytoarchitecture or estrous cycle, and it did not induce cognitive impairment, social withdrawal or anxiolytic effects. WPE inhalation prevented morphine-induced conditioned place preference and reinstatement. Similarly, WPE exposure reduced fentanyl self-administration in rats with and without neuropathic pain. We also found that WPE vapor lacks of reinforcing effects compared to the standard excipient used in most vapor administration research. Combined, these results suggest that although high-CBD vapor has modest analgesic effects, it has a robust safety profile, no abuse potential, and it significantly reduces opioid reward in females. Clinical studies examining high-CBD WPE as an adjunct treatment during opioid use disorder are highly warranted.
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Affiliation(s)
- Maria T Rivera-Garcia
- RS Dow Neurobiology Laboratories, Legacy Research Institute, Portland, OR, United States
| | - Rizelle Mae Rose
- RS Dow Neurobiology Laboratories, Legacy Research Institute, Portland, OR, United States
| | - Adrianne R Wilson-Poe
- RS Dow Neurobiology Laboratories, Legacy Research Institute, Portland, OR, United States
- Integrative Physiology and Neuroscience, Washington State University
- Corresponding author. Adrianne R Wilson-Poe, Ph.D., 1225 NE 2nd Ave, suite 249, Portland, OR 97232, USA. Tel. (503) 413-1754, (A.R. Wilson-Poe)
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Ranpara A, Stefaniak AB, Fernandez E, Bowers LN, Arnold ED, LeBouf RF. Influence of puff topographies on e-liquid heating temperature, emission characteristics and modeled lung deposition of Puff Bar ™. AEROSOL SCIENCE AND TECHNOLOGY : THE JOURNAL OF THE AMERICAN ASSOCIATION FOR AEROSOL RESEARCH 2023; 57:450-466. [PMID: 37969359 PMCID: PMC10641718 DOI: 10.1080/02786826.2023.2190786] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 02/27/2023] [Indexed: 11/17/2023]
Abstract
Puff Bar™, one of the latest designs of e-cigarettes, heats a mixture of liquid using a battery-powered coil at certain temperatures to emit aerosol. This study presents a mass-based characterization of emissions from seven flavors of Puff Bar™ devices by aerosolizing with three puff topographies [(puff volume: 55 < 65 < 75-mL) within 4-seconds at 30-seconds interval]. We evaluated the effects of puff topographies on heating temperatures; characterized particles using a cascade impactor; and measured volatile carbonyl compounds (VCCs). Modeled dosimetry and calculated mass median aerodynamic diameters (MMADs) were used to estimate regional, total respiratory deposition of the inhaled aerosol and exhaled fractions that could pose secondhand exposure risk. Temperatures of Puff Bar™ e-liquids increased with increasing puff volumes: 55mL (116.6 °C), 65 mL (128.3 °C), and 75mL (168.9 °C). Flavor types significantly influenced MMADs, total mass of particles, and VCCs (μg/puff: 2.15-2.30) in Puff Bar™ emissions (p < 0.05). Increasing puff volume (mL:55 < 65 < 75) significantly increased total mass (mg/puff: 4.6 < 5.6 < 6.2) of particles without substantially changing MMADs (~1μm:1.02~0.99~0.98). Aerosol emissions were estimated to deposit in the pulmonary region of e-cigarette user (41-44%), which could have toxicological importance. More than 2/3 (67-77%) of inhaled particles were estimated to be exhaled by users, which could affect bystanders. The VCCs measured contained carcinogens-formaldehyde (29.6%) and acetaldehyde (16.4%)-as well as respiratory irritants: acetone (23.9%), isovaleraldehyde (14.5%), and acrolein (4.9%). As Puff Bar™ emissions contain respirable particles and harmful chemicals, efforts should be made to minimize exposures, especially in indoor settings where people (including vulnerable populations) spend most of their life-time.
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Affiliation(s)
- Anand Ranpara
- Department of Physiology and Pharmacology, School of Medicine, West Virginia University, Health Science Center, Morgantown, West Virginia, USA
| | - Aleksandr B. Stefaniak
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
| | - Elizabeth Fernandez
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
| | - Lauren N. Bowers
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
| | - Elizabeth D. Arnold
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
| | - Ryan F. LeBouf
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
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Holt AK, Poklis JL, Peace MR. The history, evolution, and practice of cannabis and E-cigarette industries highlight necessary public health and public safety considerations. JOURNAL OF SAFETY RESEARCH 2023; 84:192-203. [PMID: 36868647 PMCID: PMC10829760 DOI: 10.1016/j.jsr.2022.10.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 05/29/2022] [Accepted: 10/25/2022] [Indexed: 06/18/2023]
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 & Toxicology, Virginia Commonwealth University, Richmond, VA, United States.
| | - Michelle R Peace
- Department of Forensic Science, Virginia Commonwealth University, Richmond, VA, United States.
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Abstract
Widespread uptake of vaping has signaled a sea change in the future of nicotine consumption. Vaping has grown in popularity over the past decade, in part propelled by innovations in vape pen design and nicotine flavoring. Teens and young adults have seen the biggest uptake in use of vape pens, which have superseded conventional cigarettes as the preferred modality of nicotine consumption. Relatively little is known, however, about the potential effects of chronic vaping on the respiratory system. Further, the role of vaping as a tool of smoking cessation and tobacco harm reduction remains controversial. The 2019 E-cigarette or Vaping Use-Associated Lung Injury (EVALI) outbreak highlighted the potential harms of vaping, and the consequences of long term use remain unknown. Here, we review the growing body of literature investigating the impacts of vaping on respiratory health. We review the clinical manifestations of vaping related lung injury, including the EVALI outbreak, as well as the effects of chronic vaping on respiratory health and covid-19 outcomes. We conclude that vaping is not without risk, and that further investigation is required to establish clear public policy guidance and regulation.
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Affiliation(s)
- Andrea Jonas
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, Stanford University, Stanford, CA, USA
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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: 6] [Impact Index Per Article: 3.0] [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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Mikheev VB, Ivanov A. Analysis of the Aerosol Generated from Tetrahydrocannabinol, Vitamin E Acetate, and Their Mixtures. TOXICS 2022; 10:88. [PMID: 35202274 PMCID: PMC8878975 DOI: 10.3390/toxics10020088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 02/09/2022] [Accepted: 02/11/2022] [Indexed: 01/25/2023]
Abstract
E-cigarette, or vaping, product use-associated lung injury (EVALI) outbreak was linked to vitamin E acetate (VEA) used as a solvent for tetrahydrocannabinol (THC). Several studies were conducted to assess the products of VEA (and THC/VEA mixtures) thermal degradation as a result of vaporizing/aerosolizing from a traditional type (coil-cotton wick) and ceramic type coil vape pens. The particle size distribution (PSD) of VEA aerosol and the temperature VEA and THC/VEA mixtures are heated to were also measured for a few types of traditional and ceramic vape pens. The current study assessed the PSD of the aerosol generated from THC, VEA, and a number of THC/VEA mixtures using a dab-type vape pen under two different temperature settings and two puffing flow rates. Thermal degradation of THC, VEA, and THC/VEA mixtures were also assessed, and coil temperature was measured. Results showed the dependence of the PSD upon the chemical content of the aerosolized mixture as well as upon the puffing flow rate. Minimal thermal degradation was observed. Flaws in the vape pen's design, which most likely affected results, were detected. The suitability of VEA, THC, and THC/VEA mixtures with certain types of vape pens was discussed.
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LeBouf RF, Ranpara A, Ham J, Aldridge M, Fernandez E, Williams K, Burns DA, Stefaniak AB. Chemical Emissions From Heated Vitamin E Acetate—Insights to Respiratory Risks From Electronic Cigarette Liquid Oil Diluents Used in the Aerosolization of Δ9-THC-Containing Products. Front Public Health 2022; 9:765168. [PMID: 35127617 PMCID: PMC8814346 DOI: 10.3389/fpubh.2021.765168] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 12/14/2021] [Indexed: 11/30/2022] Open
Abstract
As of February 18, 2020, the e-cigarette, or vaping, product use associated lung injury (EVALI) outbreak caused the hospitalization of a total of 2,807 patients and claimed 68 lives in the United States. Though investigations have reported a strong association with vitamin E acetate (VEA), evidence from reported EVALI cases is not sufficient to rule out the contribution of other chemicals of concern, including chemicals in either THC or non-THC products. This study characterized chemicals evolved when diluent oils were heated to temperatures that mimic e-cigarette, or vaping, products (EVPs) to investigate production of potentially toxic chemicals that might have caused lung injury. VEA, vitamin E, coconut, and medium chain triglyceride (MCT) oil were each diluted with ethanol and then tested for constituents and impurities using a gas chromatograph mass spectrometer (GC/MS). Undiluted oils were heated at 25°C (control), 150°C, and 250°C in an inert chamber to mimic a range of temperatures indicative of aerosolization from EVPs. Volatilized chemicals were collected using thermal desorption tubes, analyzed using a GC/MS, and identified. Presence of identified chemicals was confirmed using retention time and ion spectra matching with analytic standards. Direct analysis of oils, as received, revealed that VEA and vitamin E were the main constituents of their oils, and coconut and MCT oils were nearly identical having two main constituents: glycerol tricaprylate and 2-(decanoyloxy) propane-1,3-diyl dioctanoate. More chemicals were measured and with greater intensities when diluent oils were heated at 250°C compared to 150°C and 25°C. Vitamin E and coconut/MCT oils produced different chemical emissions. The presence of some identified chemicals is of potential health consequence because many are known respiratory irritants and acute respiratory toxins. Exposure to a mixture of hazardous chemicals may be relevant to the development or exacerbation of EVALI, especially when in concert with physical damage caused by lung deposition of aerosols produced by aerosolizing diluent oils.
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Affiliation(s)
- Ryan F. LeBouf
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
- *Correspondence: Ryan F. LeBouf
| | - Anand Ranpara
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Jason Ham
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Michael Aldridge
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Elizabeth Fernandez
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Kenneth Williams
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Dru A. Burns
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
| | - Aleksandr B. Stefaniak
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
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Ranpara A, Stefaniak AB, Fernandez E, LeBouf RF. Effect of Puffing Behavior on Particle Size Distributions and Respiratory Depositions From Pod-Style Electronic Cigarette, or Vaping, Products. Front Public Health 2021; 9:750402. [PMID: 34926374 PMCID: PMC8671759 DOI: 10.3389/fpubh.2021.750402] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 10/26/2021] [Indexed: 11/13/2022] Open
Abstract
The current fourth generation ("pod-style") electronic cigarette, or vaping, products (EVPs) heat a liquid ("e-liquid") contained in a reservoir ("pod") using a battery-powered coil to deliver aerosol into the lungs. A portion of inhaled EVP aerosol is estimated as exhaled, which can present a potential secondhand exposure risk to bystanders. The effects of modifiable factors using either a prefilled disposable or refillable pod-style EVPs on aerosol particle size distribution (PSD) and its respiratory deposition are poorly understood. In this study, the influence of up to six puff profiles (55-, 65-, and 75-ml puff volumes per 6.5 and 7.5 W EVP power settings) on PSD was evaluated using a popular pod-style EVP (JUUL® brand) and a cascade impactor. JUUL® brand EVPs were used to aerosolize the manufacturers' e-liquids in their disposable pods and laboratory prepared "reference e-liquid" (without flavorings or nicotine) in refillable pods. The modeled dosimetry and calculated aerosol mass median aerodynamic diameters (MMADs) were used to estimate regional respiratory deposition. From these results, exhaled fraction of EVP aerosols was calculated as a surrogate of the secondhand exposure potential. Overall, MMADs did not differ among puff profiles, except for 55- and 75-ml volumes at 7.5 W (p < 0.05). For the reference e-liquid, MMADs ranged from 1.02 to 1.23 μm and dosimetry calculations predicted that particles would deposit in the head region (36-41%), in the trachea-bronchial (TB) region (19-21%), and in the pulmonary region (40-43%). For commercial JUUL® e-liquids, MMADs ranged from 0.92 to 1.67 μm and modeling predicted that more particles would deposit in the head region (35-52%) and in the pulmonary region (30-42%). Overall, 30-40% of the particles aerosolized by a pod-style EVP were estimated to deposit in the pulmonary region and 50-70% of the inhaled EVP aerosols could be exhaled; the latter could present an inhalational hazard to bystanders in indoor occupational settings. More research is needed to understand the influence of other modifiable factors on PSD and exposure potential.
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Affiliation(s)
| | | | | | - Ryan F. LeBouf
- Respiratory Health Division, National Institute for Occupational Safety and Health, Morgantown, WV, United States
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