Differences in Subjective Experiences to First Use of Menthol and Nonmenthol Cigarettes in a National Sample of Young Adult Cigarette Smokers

Youth and young adult flavour expectancies for new 'non-menthol' cigarettes introduced following California's ban on flavoured tobacco products

BACKGROUND

Following California's statewide law prohibiting the sale of flavoured tobacco products, some cigarette brands introduced new variants advertised as non-menthol, yet featuring design and text commonly found in menthol cigarette marketing.

METHODS

Data are from the February-May 2023 wave of the Tobacco Epidemic Evaluation Network (TEEN+) national probability-based survey (aged 13-25 years). Respondents (N=10 217) were shown images of two (of four) 'new non-menthol' brand ads or packaging and two comparators ('classic' non-menthol and menthol cigarette brands). Respondents reported expected taste of each (no or any minty/menthol taste; 'don't know'). Multinomial regression models tested associations between predictors (age, gender identity, race and ethnicity, perceived financial situation, smoking status) and expectation of minty/menthol taste.

RESULTS

Younger age was associated with expectations of minty/menthol taste, controlling for covariates. Respondents aged 13-17 years had greater odds of expecting minty/menthol taste than no minty/menthol taste for all tested new non-menthol brands (Camel Crush Oasis adjusted OR (aOR): 1.30, p<0.05; Camel Crisp aOR: 1.47, p<0.001; Kool Non-Menthol Blue aOR: 1.27, p<0.05; Kool Non-Menthol Green aOR: 1.43, p<0.01), compared to respondents aged 21 and older. Respondents aged 18-20 years had greater odds of reporting minty/menthol expectancies than no minty/menthol expectancies for Camel Crush Oasis (aOR: 1.35, p<0.05) and Kool Non-Menthol Green (aOR: 1.29, p<0.05) compared to those aged 21-25 years. Compared to non-Hispanic white respondents, non-Hispanic Asian respondents had greater odds of expecting minty/menthol taste than no minty/menthol taste for Camel Crush Oasis (aOR: 1.89, p<0.01), Kool Non-Menthol Blue (aOR: 1.88, p<0.01) and Kool Non-Menthol Green (aOR: 1.72, p<0.05).

DISCUSSION

Younger age was associated with expectations of new non-menthol cigarettes having a minty/menthol taste. Results raise concerns regarding the potential appeal of these products to youth and young adults.

Effects of liquid nicotine concentration and flavour on the acceptability of electronic nicotine delivery systems (ENDS) among people who smoke participating in a randomised controlled trial to reduce cigarette consumption

BACKGROUND

Research is needed to understand the acceptability of electronic nicotine delivery systems (ENDS) as a smoking reduction aid. This study examines the acceptability of ENDS by liquid nicotine concentration and flavour among people who smoke using ENDS to reduce their smoking.

METHODS

People who smoke cigarettes but were naïve to ENDS participated in a double-blind randomised controlled trial to reduce conventional cigarette smoking. Participants were randomised to either a control cigarette substitute (CS) or one of three ENDS groups; 0 mg/mL, 8 mg/mL or 36 mg/mL nicotine concentration. ENDS flavour was chosen by the participant (tobacco or menthol). Participants reported their CS, ENDS and cigarettes per day (CPD) from the past 7 days at 1-month, 3-month and 6-month follow-up visits. Participants also reported side effects and measures of satisfaction, psychological reward, aversion and craving relief. Outcome variables were modelled using linear mixed effects by the following groups: liquid nicotine concentration, flavour and a flavour-nicotine concentration interaction.

RESULTS

Participants (n=520) were 41.2% male, 67.3% white, had a mean age of 46.2 years and smoked a mean of 18.6 CPD (SD=7.74) at baseline. All flavour and concentration groups decreased CPD from baseline to all follow-up visits with the 36 mg/mL experiencing the greatest reduction, compared with the 0 mg/mL and 8 mg/mL groups. All groups except the 36 mg/mL group decreased their product use over time. The use of menthol flavour was associated with fewer side effects at 3 months (p=0.02) and lesser aversion at 1 month (p=0.03) compared with tobacco-flavoured ENDS. The 36 mg/mL group experienced the greatest craving relief and greatest aversion compared with other groups.

CONCLUSIONS

Both nicotine concentration and flavour appear to have independent, as well as interactive, effects that influence ENDS acceptability among people who use cigarettes.

Racial/ethnic differences in the association between menthol cigarette use and mental illness among adults who smoke in the United States

Data from the National Survey on Drug Use and Health (2012-2018) were used to characterize the association between menthol cigarette use and indicators of Any (AMI) and Serious (SMI) Mental Illness among adults who smoke in the United States. In general, people who smoke menthol cigarettes were more likely to have AMI (aOR = 1.123 [1.063-1.194]) than people who smoke non-menthol cigarettes, but not SMI (aOR = 1.065 [0.966-1.175]). However, among non-Hispanic African American/Black people who smoke, those that used menthol cigarettes had lower adjusted odds of both AMI (aOR = 0.740 [0.572-0.958]) and SMI (aOR = 0.592 [0.390-0.899]) than their counterparts who used non-menthol cigarettes. Results suggest there may be race/ethnicity-specific drivers of the association between menthol cigarette use and mental illness.

Trends in Education-Related Smoking Disparities Among U.S. Black or African American and White Adults: Intersections of Race, Sex, and Region

INTRODUCTION

Despite its overall decline in the United States, trends in cigarette smoking could vary by intersection with demographic characteristics. We explored trends in education-related disparities in current smoking among U.S. adults by race (Black or African American and White), sex, and U.S. census region.

AIMS AND METHODS

Data were from U.S. civilian non-institutionalized adults (aged ≥18 years) who self-identified as Black or African American and White and participated in the 1995-2019 Tobacco Use Supplement to the Current Population Survey. We estimated average annual percent changes in current cigarette smoking by the intersections of race, sex, census region, and educational attainment. We calculated educated-related prevalence differences in current cigarette smoking by subtracting the prevalence of bachelor's degrees from that of

RESULTS

Education-related disparities in current cigarette smoking increased over time, especially among Black or African American male (PD1995-1996 = 22.8%; PD2018-2019 = 27.2%) and female adults (PD1995-1996 = 12.1%; PD2018-2019 = 16.5%). By region, Black or African American male adults in the Midwest showed the largest increase in education-related current cigarette smoking disparities, followed by Black or African American male and female adults in the South, and White male and female adults in the Midwest. These findings were because of small to no declines in the prevalence of current cigarette smoking among those with

CONCLUSION AND RELEVANCE

The gap in the prevalence of current cigarette smoking by education widened over time, especially among Black or African American adults in certain regions.

IMPLICATIONS

Despite the decline in the prevalence of current cigarette smoking in the U.S. population overall, such public health gain may not benefit all individuals equally. Using the data from a U.S. representative serial cross-sectional survey study during 1995-2019, we found that disparities in current cigarette smoking prevalence between those with Collapse

Key Words Collapse

MESH Headings

• Adult
• Female
• Humans
• Male
• Black or African American
• Cigarette Smoking/epidemiology
• Cross-Sectional Studies
• Educational Status
• Prevalence
• Surveys and Questionnaires
• United States/epidemiology
• White
• Health Status Disparities

Collapse

Grants

• FDA HHS
• NIMHD NIH HHS
• National Institute on Minority Health and Health Disparities
• U.S. Food and Drug Administration

Collapse

Affiliation(s)

Kelvin Choi Division of Intramural Research, National Institute on Minority Health and Health Disparities, Bethesda, Maryland, USA
Jamal T Jones Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Beltsville, Maryland, USA
Andrea L Ruybal Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Beltsville, Maryland, USA
Timothy S McNeel Information Management Services, Inc., Calverton, Maryland, USA
Danielle A Duarte Division of Intramural Research, National Institute on Minority Health and Health Disparities, Bethesda, Maryland, USA
Monica Webb Hooper Office of the Director, National Institute on Minority Health and Health Disparities, Bethesda, Maryland, USA

Collapse

Racial Disparities in Flavored Tobacco Product Use, Curiosity, Susceptibility, and Harm Perception, National Youth Tobacco Survey 2019-2020

Introduction

Studies characterizing differences in youth flavored tobacco product use prevalence, curiosity/susceptibility, and harm perceptions by race and ethnicity are limited. This study comprehensively examines flavored tobacco product use and harm perceptions among U.S. middle and high school students, by race and ethnicity.

Methods

Data came from the 2019 (N=19,018) and 2020 (N=14,531) National Youth Tobacco Surveys (NYTS). Weighted prevalence estimates of flavored tobacco product use and curiosity, susceptibility, and harm perception are reported by race and ethnicity (non-Hispanic [NH] White, NH Black, Hispanic, or NH Other). t-Tests assessed differences in prevalence by years and racial/ethnic groups.

Results

Among youth with past 30-day tobacco use, use of most flavored tobacco products increased across all racial/ethnic groups; the largest increase was observed among Hispanic youth using other flavored tobacco products (30.3%). The group with the highest susceptibility to future electronic cigarette (e-cigarette) use was Hispanic students (42.3%). Hispanic students had the highest curiosity about and susceptibility to future use of cigarettes and cigars as well.

Conclusions

Increases in the use of and higher susceptibility to other flavored tobacco products, particularly among Hispanic youth, suggest a need for additional changes in environmental conditions and possibly targeted or tailored tobacco control interventions for Hispanic youth.

Implications

Given that flavored tobacco use is prevalent among youth and aggressively marketed more to racial/ethnic minority populations, it is important to understand how susceptibility and perceptions relate to tobacco use. Our results suggest a need for a better understanding of social and environmental factors that drive tobacco use behaviors and perceptions, particularly among Hispanic youth, to address the root causes of these differences and create more equitable tobacco control interventions.

Impact of a reduced nicotine standard on young adult appeal for menthol and non-menthol cigarettes

INTRODUCTION

The Food and Drug Administration (FDA) announced its intention to reduce the nicotine content in cigarettes as a strategy to promote cessation and reduce smoking-related harm. A low nicotine product standard will apply to all cigarettes on the market, including menthol cigarettes. In December 2021, the FDA approved a modified risk tobacco product application for menthol and non-menthol flavoured very low nicotine cigarettes (VLNC) from the 22nd Century Group. Notably, experimentation with menthol cigarettes is linked to smoking progression, as well as greater nicotine dependence relative to non-menthol cigarette use. If menthol VLNCs are perceived as more appealing than non-menthol VLNCs, this would indicate that some aspect of menthol may maintain smoking even in the absence of nicotine and FDA's regulatory authority to ban or restrict the sale of menthol cigarettes should apply to reduced nicotine content of cigarettes. In April 2022, the FDA announced proposed rulemaking to prohibit menthol cigarettes, however it is unclear if a menthol prohibition would apply to VLNCs.

METHODS AND ANALYSIS

This study will recruit 172 young adult menthol smokers (with a specific subsample of n=40 sexual and gender minority young adults) and measure appeal for smoking experimental menthol and non-menthol VLNCs, and the impact of proposed product standards on tobacco product purchasing behaviour using an Experimental Tobacco Marketplace. Appeal across product standards will be assessed in a controlled laboratory and using ecological momentary assessment.

ETHICS AND DISSEMINATION

The protocol was approved by the University of Oklahoma Health Sciences Center Institutional Review Board (#11865). Findings will examine the effects of a reduced nicotine standard and a menthol ban on young adult smoking and will be disseminated through peer-reviewed journal articles and presentations at scientific conferences.

TRIAL REGISTRATION NUMBER

NCT04340947.

Impairment of Endothelial Function by Cigarette Smoke Is Not Caused by a Specific Smoke Constituent, but by Vagal Input From the Airway

BACKGROUND

Exposure to tobacco or marijuana smoke, or e-cigarette aerosols, causes vascular endothelial dysfunction in humans and rats. We aimed to determine what constituent, or class of constituents, of smoke is responsible for endothelial functional impairment.

METHODS

We investigated several smoke constituents that we hypothesized to mediate this effect by exposing rats and measuring arterial flow-mediated dilation (FMD) pre- and post-exposure. We measured FMD before and after inhalation of sidestream smoke from research cigarettes containing normal and reduced nicotine level with and without menthol, as well as 2 of the main aldehyde gases found in both smoke and e-cigarette aerosol (acrolein and acetaldehyde), and inert carbon nanoparticles.

RESULTS

FMD was reduced by all 4 kinds of research cigarettes, with extent of reduction ranging from 20% to 46% depending on the cigarette type. While nicotine was not required for the impairment, higher nicotine levels in smoke were associated with a greater percent reduction of FMD (41.1±4.5% reduction versus 19.2±9.5%; P=0.047). Lower menthol levels were also associated with a greater percent reduction of FMD (18.5±9.8% versus 40.5±4.8%; P=0.048). Inhalation of acrolein or acetaldehyde gases at smoke-relevant concentrations impaired FMD by roughly 50% (P=0.001). However, inhalation of inert carbon nanoparticles at smoke-relevant concentrations with no gas phase also impaired FMD by a comparable amount (P<0.001). Bilateral cervical vagotomy blocked the impairment of FMD by tobacco smoke.

CONCLUSIONS

There is no single constituent or class of constituents responsible for acute impairment of endothelial function by smoke; rather, we propose that acute endothelial dysfunction by disparate inhaled products is caused by vagus nerve signaling initiated by airway irritation.

Behavioural intentions in response to a potential menthol cigarette sales ban: a survey examining smokers in Washington, DC public housing

OBJECTIVES

Local, national and international policies are being proposed to ban the sale of menthol-flavoured tobacco products. With more bans being implemented, it is increasingly important to understand reactions to these bans among smokers of low socioeconomic status. This study examined public housing residents' behavioural intentions if menthol-flavoured cigarettes were no longer sold.

SETTING

15 District of Columbia Housing Authority properties between March 2019 and March 2021.

PARTICIPANTS

221 District of Columbia Housing Authority residents ages 18-80 years who reported smoking menthol cigarettes (83.3% African-American/black).

PRIMARY AND SECONDARY OUTCOMES

Cigarette quitting and switching intentions due to a hypothetical menthol-flavoured cigarette sales ban.

RESULTS

Nearly one-half (48.0%) of residents said they intended to quit cigarette use if menthol-flavoured products were no longer sold, while 27.2% were unsure if they would quit, and 24.9% reported they would not quit. Older residents (OR 0.94 per year, 95% CI 0.91 to 0.97), senior/disabled building versus family building residents (OR 0.50, 95% CI 0.25 to 0.97), those who smoked within 30 min of waking (OR 0.48, 95% CI 0.23 to 0.98) and daily smokers (OR 0.42, 95% CI 0.21 to 0.84) had lower odds of reporting quit intentions associated with a menthol ban. Of those not intending to quit, 40.7% reported they would switch to non-menthol cigarettes, 20.4% to another non-menthol product, 13.0% to menthol e-cigarettes and 20.4% to another menthol product.

CONCLUSIONS

Results suggest banning the sale of menthol-flavoured products has the potential to impact cigarette smoking cessation. Nearly three-quarters of smokers in public housing indicated a possibility of quitting smoking because of a menthol cigarette ban. Bans that include all flavours in all tobacco products may be most effective for facilitating overall tobacco cessation.

Use of Menthol Cigarettes, Smoking Frequency, and Nicotine Dependence Among US Youth

IMPORTANCE

Menthol may make cigarette smoke less aversive and could lead youth to smoke more frequently and become more dependent on nicotine.

OBJECTIVE

To assess the association of menthol use with cigarette smoking frequency and nicotine dependence (ND) among youth cigarettes users.

DESIGN, SETTING, AND PARTICIPANTS

This cohort study used a pooled sample of cohorts of US youth (aged 12-17 years at their baseline and follow-up interviews) in the Population Assessment of Tobacco and Health Study (September 2013 to November 2019). Household interviews were conducted using audio computer-assisted self-interviews. US youth who were past-30-day cigarette smokers at any of wave 2 through wave 5, completed the preceding survey (eg, wave 2 past-30-day cigarette smokers completed wave 1), and indicated whether they used menthol cigarettes were eligible. The association of menthol use with smoking frequency and ND was estimated using inverse probability of treatment weighting adjusted mean differences (aMDs), adjusted risk ratios (aRRs), and corresponding 95% CIs. Data were analyzed from December 2021 to March 2022.

EXPOSURES

Menthol use and transitions in use (switching to or from menthol cigarettes).

MAIN OUTCOMES AND MEASURES

Main outcomes were the number of days smoked in the past 30 days, the risk of frequent smoking (smoking ≥20 days in the past 30 days), and symptoms of ND.

RESULTS

There were a total of 1492 observations among 1096 US youth cigarette smokers, of whom 49.4% were female, 67.2% were non-Hispanic White, and 28.7% were aged 12 to 14 years at their baseline survey (all percentages are weighted). Among those who switched from not smoking to smoking (61% of the sample), menthol use was associated with smoking on 3.1 additional days (aMD; 95% CI, 1.9 to 4.2 days), 59% higher risk of being a frequent smoker (aRR, 1.59; 95% CI, 1.23 to 2.06), and 10% higher ND scores (aMD, 1.09; 95% CI, 1.02 to 1.17). Switching from smoking menthol to smoking nonmenthol (vs maintaining menthol use) was associated with smoking on 3.6 fewer days (aMD; 95% CI, -6.3 to -0.9 days) and 47% lower risk of being a frequent smoker (aRR, 0.68; 95% CI, 0.50 to 0.92).

CONCLUSIONS AND RELEVANCE

These findings suggest that the addition of menthol to cigarettes is associated with increased smoking frequency and ND among US youth.

Neurobiological Mechanisms of Nicotine Reward and Aversion

Neuronal nicotinic acetylcholine receptors (nAChRs) regulate the rewarding actions of nicotine contained in tobacco that establish and maintain the smoking habit. nAChRs also regulate the aversive properties of nicotine, sensitivity to which decreases tobacco use and protects against tobacco use disorder. These opposing behavioral actions of nicotine reflect nAChR expression in brain reward and aversion circuits. nAChRs containing α4 and β2 subunits are responsible for the high-affinity nicotine binding sites in the brain and are densely expressed by reward-relevant neurons, most notably dopaminergic, GABAergic, and glutamatergic neurons in the ventral tegmental area. High-affinity nAChRs can incorporate additional subunits, including β3, α6, or α5 subunits, with the resulting nAChR subtypes playing discrete and dissociable roles in the stimulatory actions of nicotine on brain dopamine transmission. nAChRs in brain dopamine circuits also participate in aversive reactions to nicotine and the negative affective state experienced during nicotine withdrawal. nAChRs containing α3 and β4 subunits are responsible for the low-affinity nicotine binding sites in the brain and are enriched in brain sites involved in aversion, including the medial habenula, interpeduncular nucleus, and nucleus of the solitary tract, brain sites in which α5 nAChR subunits are also expressed. These aversion-related brain sites regulate nicotine avoidance behaviors, and genetic variation that modifies the function of nAChRs in these sites increases vulnerability to tobacco dependence and smoking-related diseases. Here, we review the molecular, cellular, and circuit-level mechanisms through which nicotine elicits reward and aversion and the adaptations in these processes that drive the development of nicotine dependence. SIGNIFICANCE STATEMENT: Tobacco use disorder in the form of habitual cigarette smoking or regular use of other tobacco-related products is a major cause of death and disease worldwide. This article reviews the actions of nicotine in the brain that contribute to tobacco use disorder.

Influence of Cannabinoid Receptor 1 Genetic Variants on the Subjective Effects of Smoked Cannabis

As many jurisdictions consider relaxing cannabis legislation and usage is increasing in North America and other parts of the world, there is a need to explore the possible genetic differences underlying the subjective effects of cannabis. This pilot study investigated specific genetic variations within the cannabinoid receptor 1 (CNR1) gene for association with the subjective effects of smoked cannabis. Data were obtained from a double-blinded, placebo-controlled clinical trial studying the impact of cannabis intoxication on driving performance. Participants randomized to the active cannabis group who consented to secondary genetic analysis (n = 52) were genotyped at the CNR1 rs1049353 and rs2023239 polymorphic areas. Maximum value and area under the curve (AUC) analyses were performed on subjective measures data. Analysis of subjective effects by genotype uncovered a global trend towards greater subjective effects for rs1049353 T-allele- and rs2023239 C-allele-carrying subjects. However, significant differences attributed to allelic identity were only documented for a subset of subjective effects. Our findings suggest that rs1049353 and rs2023239 minor allele carriers experience augmented subjective effects during acute cannabis intoxication.

The Biological Impact of Menthol on Tobacco Dependence

In the 1920s, tobacco companies created a marketing campaign for what would one day be their most profitable series of products: mentholated tobacco cigarettes. Menthol provides the smoker with a pleasant mint flavor in addition to a cooling sensation of the mouth, throat, and lungs, giving relief from the painful irritation caused by tobacco smoke. Promising a healthier cigarette using pictures of doctors in white coats and even cartoon penguins, tobacco companies promoted these cigarettes to young, beginner smokers and those with respiratory health concerns. Today, smoking tobacco cigarettes causes one in five US Americans to die prematurely, crowning it as the leading cause of preventable death. In contrast to the dubious health claims by tobacco companies, mentholated cigarettes are in fact more addictive. Smokers of mentholated cigarettes have lower successful quit rates and in some cases are resistant to both behavioral and pharmacological treatment strategies. There is now considerable evidence, especially in the last 5 years, that suggest menthol might influence the addictive potential of nicotine-containing tobacco products via biological mechanisms. First, menthol alters the expression, stoichiometry, and function of nicotinic receptors. Second, menthol's chemosensory properties operate to mask aversive properties of using tobacco products. Third, menthol's chemosensory properties aid in serving as a conditioned cue that can both enhance nicotine intake and drive relapse. Fourth, menthol alters nicotine metabolism, increasing its bioavailability. This review discusses emerging evidence for these mechanisms, with an emphasis on preclinical findings that may shed light on why menthol smokers exhibit greater dependence.

IMPLICATIONS

Mentholated cigarettes have been shown to have greater addictive potential than their nonmentholated counterparts. Evidence is pointing toward multiple mechanisms of action by which menthol may alter tobacco dependence. Understanding menthol's biological functions as it pertains to nicotine dependence will be helpful in crafting novel pharmacotherapies that might better serve menthol smokers. In addition, a better understanding of menthol's pharmacology as it relates to tobacco dependence will be valuable for informing policy decisions on the regulation of mentholated cigarettes.

Assessing cigarette packaging and labelling policy effects on early adolescents: results from a discrete choice experiment

INTRODUCTION

Cigarette packaging is a primary channel for tobacco advertising, particularly in countries where traditional channels are restricted. The current study evaluated the independent and interactive effects of cigarette packaging and health warning label (HWL) characteristics on perceived appeal of cigarette brands for early adolescents in Mexico.

METHODS

A discrete choice experiment (DCE) was conducted with early adolescents, aged 12-14 years (n=4251). The DCE involved a 3×25 design with six attributes: brand (Marlboro, Pall Mall, Camel), tobacco flavour (regular, menthol), flavour capsule (none, 1 or 2 capsules), presence of descriptive terms, branding (vs plain packaging), HWL size (30%, 75%) and HWL content (emphysema vs mouth cancer). Participants viewed eight sets of three cigarette packs and selected a pack in each set that: (1) is most/least attractive, (2) they are most/least interested in trying or (3) is most/least harmful, with a no difference option.

RESULTS

Participants perceived packs as less attractive, less interesting to try and more harmful if they had plain packaging or had larger HWLs, with the effect being most pronounced when plain packaging is combined with larger HWLs. For attractiveness, plain packaging had the biggest influence on choice (43%), followed by HWL size (19%). Interest in trying was most influenced by brand name (34%), followed by plain packaging (29%). Perceived harm was most influenced by brand name (30%), followed by HWL size (29%).

CONCLUSION

Increasing the size of HWLs and implementing plain packaging appear to reduce the appeal of cigarettes to early adolescents. Countries should adopt these policies to minimise the impact of tobacco marketing.

Research on Youth and Young Adult Tobacco Use, 2013-2018, From the Food and Drug Administration-National Institutes of Health Tobacco Centers of Regulatory Science

The Tobacco Regulatory Science Program is a collaborative research effort between the National Institutes of Health (NIH) and the Food and Drug Administration (FDA). In 2013, the NIH funded 14 Tobacco Centers of Regulatory Science (TCORS), which serve as partners in establishing research, training, and professional development programs to guide FDA. Each of the fourteen TCORS, and two other NIH-funded research programs, the Center for the Evaluation of Nicotine in Cigarettes (CENIC) and the Consortium on Methods Evaluating Tobacco (COMET), pursued specific research themes relevant to FDA's priorities. A key mandate for FDA is to reduce tobacco use among young people. This article is a review of the peer-reviewed research, including published and in-press manuscripts, from the TCORS, CENIC, and COMET, which provides specific data or other findings on youth (ages 10-18 years) and/or young adults (ages 18-34 years), from 2013 to 2018. Citations of all TCORS, CENIC, and COMET articles from September 2013 to December 2017 were collected by the TCORS coordinating center, the Center for Evaluation and Coordination of Training and Research. Additional citations up to April 30, 2018 were requested from the principal investigators. A scoring rubric was developed and implemented to assess study type, primary theme, and FDA priority area addressed by each article. The major subareas and findings from each priority area are presented. There were 766 articles in total, with 258 (34%) focusing on youth and/or young adults. Findings relevant to FDA from this review concern impact analysis, toxicity, health effects, addiction, marketing influences, communications, and behavior.

IMPLICATIONS

The Tobacco Centers of Regulatory Science, CENIC, and COMET have had a high output of scientific articles since 2013. These Centers are unique in that the FDA supports science specifically to guide future regulatory actions. The 258 articles that have focused on youth and/or young adults are providing data for regulatory actions by the FDA related to the key priority areas such as the addictiveness of non-cigarette products, the effects of exposure to electronic cigarette marketing on initiation and cessation, and the impact of flavored products on youth and young adult tobacco use. Future regulations to reduce tobacco use will be guided by the cumulative evidence. These Centers are one innovative mechanism to promote important outcomes to advance tobacco regulatory science.

Correlates of youth vaping flavor preferences

Among youth who use electronic nicotine delivery systems (ENDS), e-cigarettes are often the first tobacco product tried. Flavor is a common reason for experimentation with e-cigarettes. This study assessed flavor preferences and the choice of ENDS as an initial product among youth by selected demographic characteristics. The analysis sample included 1549 participants who had ever tried ENDS, drawn from a national online survey of youth aged 13-18 in 2017. Fruit was the most common favorite flavor among ENDS users, followed by menthol/mint/wintergreen. Preference for flavor varied by age, sex and racial/ethnic background. ENDS were the tobacco products most likely to be tried first, particularly among participants under age 17. Those who preferred fruit flavor were twice as likely to have tried ENDS first, compared to those with other flavor preferences, while those who preferred menthol/mint/wintergreen flavor were half as likely to have tried ENDS first. Our findings support an association between flavor and ENDS use. Our research supports previous findings indicating that: 1) flavor is one of the primary reasons for experimentation with ENDS among youth; 2) fruit flavor is strongly associated with use of ENDS as the first tobacco product; and 3) preference of fruit flavor varies by age, sex and racial/ethnic background. These findings have relevance for developing targeted messages for specific youth audiences and implications for tobacco regulatory policies. In addition to January 2020 federal regulations, the authors recommend tighter restrictions, specifically that the marketing and sale of all e-cigarette flavors other than tobacco be eliminated.

Effect of electric heating and ice added to the bowl on mainstream waterpipe semivolatile furan and other toxicant yields

OBJECTIVES

We examined mainstream total particulate matter, nicotine, cotinine, menthol, pyrene, carbon monoxide (CO) and semivolatile furan yields from a commercial waterpipe with two methods for heating the tobacco, quick-light charcoal (charcoal) and electric head (electric) and two water bowl preparations: with (ice) and without ice (water).

METHODS

Emissions from a single brand of popular waterpipe tobacco (10 g) were generated using machine smoking according to a two-stage puffing regimen developed from human puffing topography. Tobacco and charcoal consumption were calculated for each machine smoking session as mass lost, expressed as a fraction of presmoking mass.

RESULTS

The heating method had the greatest effect on toxicant yields. Electric heating resulted in increases in the fraction of tobacco consumed (2.4 times more, p<0.0001), mainstream nicotine (1.4 times higher, p=0.002) and semivolatile furan yields (1.4 times higher, p<0.03), and a decrease in mainstream CO and pyrene yields (8.2 and 2.1 times lower, respectively, p<0.001) as compared with charcoal. Adding ice to the bowl resulted in higher furan yields for electric heating. Menthol yields were not different across the four conditions and averaged 0.16±0.03 mg/session. 2-Furaldehyde and 5-(hydroxymethyl)-2-furaldehyde yields were up to 230 and 3900 times higher, respectively, than those reported for cigarettes.

CONCLUSION

Waterpipe components used to heat the tobacco and water bowl preparation can significantly affect mainstream toxicant yields. Mainstream waterpipe tobacco smoke is a significant source of inhalation exposure to semivolatile furans with human carcinogenic and mutagenic potential. These data highlight the need for acute and chronic inhalation toxicity data for semivolatile furans and provide support for the establishment of limits governing sugar additives in waterpipe tobacco and educational campaigns linking waterpipe tobacco smoking behaviours with their associated harm.

Examining the role of menthol cigarettes in progression to established smoking among youth

BACKGROUND

Menthol, a flavoring compound added to cigarettes, makes cigarettes more appealing to youth and inexperienced smokers and increases cigarettes' abuse liability. However, limited studies are available on menthol's role in smoking progression.

METHODS

To assess the association between menthol in cigarettes and progression to established smoking, we used five waves of data from the Evaluation of Public Education Campaign on Teen Tobacco Cohort Study, a nationally representative longitudinal survey of U.S. youth conducted as part of "The Real Cost" evaluation. We used discrete time survival analysis to model the occurrence of two event outcomes-progression to established, current smoking and progression to established, frequent smoking-using a logit model with a menthol use indicator as the key explanatory variable. Based on this framework, we estimated the effect of prior menthol use on the odds of smoking progression.

RESULTS

In the progression to established, current smoking model, prior menthol use was significantly associated with progression [adjusted odds ratio (aOR) = 1.80, p < .05, confidence interval (CI) = (1.03-3.16)]. While results were in a similar direction for the model of progression to established, frequent smoking, the association between prior menthol use and this progression model did not reach significance [aOR = 1.56, CI = (0.80-3.03)].

CONCLUSION

The results suggest a relationship between using menthol cigarettes and progression from experimental to established, current smoking among youth. This study adds to a growing literature base that supports that menthol cigarettes, compared to nonmenthol cigarettes, put youth at increased risk for regular cigarette use.

Menthol Smoking Patterns and Smoking Perceptions Among Youth: Findings From the Population Assessment of Tobacco and Health Study

INTRODUCTION

Youth may be attracted to menthol cigarettes because they are perceived as less harmful and harsh to smoke relative to non-menthol cigarettes. This study examined demographic factors and menthol cigarette smoking patterns as correlates of youth harm perceptions of cigarette smoking and ease of smoking menthol versus non-menthol cigarettes.

METHODS

Data were from the Wave 1 (2013-2014) youth sample of the Population Assessment of Tobacco and Health Study. Weighted multivariable logistic regression models were used to examine correlations between demographic factors and menthol cigarette smoking patterns (menthol initiation, past 30-day menthol cigarette smoking, and menthol cigarette brand preference), with harm perceptions of cigarette smoking and ease of smoking a menthol cigarette.

RESULTS

Nearly half of ever cigarette smoking youth (43%) first used a menthol cigarette; 21% reported past 30-day menthol cigarette smoking; and 42% of past 30-day smokers providing brand information used a menthol cigarette as their preferred brand. In bivariate analyses, initiation with a menthol cigarette and menthol brand preference (versus non-menthol) were correlated with black race, older age at initiation, and past 30-day menthol cigarette smoking. In adjusted models, past 30-day menthol cigarette smoking and menthol cigarette brand preference, but not menthol initiation, were correlated with the perception that menthol cigarettes are easier to smoke.

CONCLUSIONS

Youth who smoke menthol cigarettes perceive them as easier to smoke, even after adjusting for other factors. Age of initiation and black race emerged as correlates of menthol cigarette initiation, brand preference, and cigarette harm perceptions, and may inform future prevention campaigns.