Effects of Cigarette Nicotine Content and Menthol Preference on Perceived Health Risks, Subjective Ratings, and Carbon Monoxide Exposure Among Adolescent Smokers

Racial/ethnic differences in the acute effects of reduced nicotine content cigarettes among adolescents who smoke

OBJECTIVE

Reducing the nicotine content in cigarettes decreases their addictiveness and abuse liability, including among adolescents. Whether these effects differ by race/ethnicity is unknown. This study is a secondary analysis of previously published data collected between 2014-2017. We examined racial/ethnic differences in the effects of smoking cigarettes with varying nicotine content levels on subjective effects and tobacco withdrawal among adolescents who smoke daily.

METHODS

Across two counterbalanced sessions, 50 adolescents recruited from Rhode Island (ages 15-19; 30 % Underrepresented Minorities [URM], 20 % Asians and Pacific Islanders [API]; 50 % Non-Hispanic Whites) self-administered a very low nicotine content (VLNC; 0.4 mg nicotine/g of tobacco) or normal nicotine content control (NNC; 15.8 mg/g) research cigarette following overnight abstinence. Subjective effects were reported post-administration and tobacco withdrawal outcomes were calculated from pre- to post-administration scores. Multilevel linear models tested main and interactive effects between cigarette nicotine content and race/ethnicity on all study outcomes.

RESULTS

Participants reported lower positive subjective effects and reductions in smoking urges after smoking a VLNC cigarette relative to smoking an NNC cigarette (ps < 0.01). A main effect of race/ethnicity emerged, such that API (vs. URM and White) adolescents reported lower positive subjective effects, greater craving reduction, and higher cigarette aversion after smoking, regardless of nicotine content (ps < 0.05). Significant interactions were found between race/ethnicity and nicotine content for cigarette aversion, such that API adolescents rated VLNC (vs. NNC) cigarettes as less aversive than White and URM adolescents did (p = 0.03).

CONCLUSIONS

Findings provide evidence that VLNC cigarettes may reduce abuse liability and tobacco withdrawal symptoms for adolescents across racial/ethnic groups and particularly for API youth.

Messaging about very low nicotine cigarettes (VLNCs) to influence policy attitudes, harm perceptions and smoking motivations: a discrete choice experiment

BACKGROUND

To reduce smoking and the harms it causes, countries, including the USA, are considering policies to reduce nicotine in combustible tobacco to minimally addictive levels. Effective messages about very low nicotine cigarettes (VLNCs) and this policy are crucial in combating misperceptions threatening the policy's effectiveness.

DATA AND METHODS

A discrete choice experiment assessed messages about VLNCs. Participants were 590 adults who smoked exclusively, 379 adults who both smoked and used e-cigarettes, 443 adults who formerly smoked and 351 young adults who never smoked (total n=1763). Seven message attributes were varied systematically (source, harm, chemicals, nicotine, satisfaction, addictiveness and quitting efficacy). Outcomes were selection of messages that generated the most positive attitude towards reduced nicotine policy, the greatest perceived harmfulness of VLNCs, and most strongly motivated quitting and initiating behaviour for VLNCs.

RESULTS

Information about specific harms and chemicals of VLNCs had the largest effects on selection of messages as eliciting more negative attitudes towards VLNCs policy, increasing perceived VLNC harmfulness, increasing motivation to quit VLNCs and decreasing motivation to try VLNCs. Messages with information about quitting efficacy were selected as more motivating to quit among those who smoke, but also more motivating to try VLNCs among those who do not smoke.

CONCLUSION

Harm and chemical information can be prioritised to ensure VLNCs are not misperceived as less harmful than regular cigarettes. Messages about increased quitting efficacy and reduced addictiveness associated with VLNCs may backfire if presented to those who do not smoke.

Comparison of urine heavy metals in exclusive menthol and non-menthol cigarette users by race/ethnicity: The 2015-2016 National Health and Nutrition Examination Survey Special Sample

INTRODUCTION

The objective of this study was to investigate the differences in urine concentrations of heavy metals (uranium, cadmium, and lead) between exclusive menthol and non-menthol cigarette smokers across three racial/ethnic groups using data from the National Health and Nutrition Examination Survey (NHANES) 2015-2016 Special Sample.

METHODS

Data from NHANES 2015-2016 Special Sample were analyzed to assess the association between menthol smoking and heavy metal biomarkers in urine across three racial/ethnic groups (N=351), including Non-Hispanic White (NHW), Non-Hispanic Black (NHB), and Hispanic/Other (HISPO). Multivariable linear regression models were used to estimate adjusted geometric means (GMs) and ratio of GMs (menthol/non-menthol smokers) (RGMs) for urine biomarkers of heavy metals between menthol and non-menthol smokers by race/ethnicity.

RESULTS

Among the 351 eligible participants, 34.4% (n=121) were NHW, 33.6% (n=118) were NHB, and 32.0% (n=112) were HISPO exclusive cigarette smokers. The analysis revealed significantly higher concentrations of urine uranium in NHB menthol smokers compared to NHB non-menthol smokers (RGMs=1.3; 95% CI: 1.0-1.6; p=0.04). NHW menthol smokers appeared to have higher levels of urine uranium than non-menthol smokers, but the difference was not statistically significant (9.0 vs 6.3; RGMs=1.4; 95% CI: 1.0-2.2; p=0.08). There were no significant differences in urine metals (cadmium and lead) by menthol status among NHW, NHB, or HISPO cigarette smokers (p>0.05).

CONCLUSIONS

The research findings regarding the higher levels of urine uranium among Non-Hispanic Black (NHB) menthol cigarette smokers raise questions about the claims suggesting that additives in cigarettes do not contribute to increased toxicity.

Qualitative reactions to a low nicotine product standard for cigarettes from adolescents and young adults living in the United States who smoke

The Biden Administration is considering a low nicotine product standard for cigarettes. This qualitative study examined reactions to a nicotine reduction policy among adolescents and young adults (AYA) who smoke cigarettes. After completing a lab study involving masked exposure either to low nicotine or normal nicotine research cigarettes and unmasked exposure to e-cigarettes varying in nicotine concentration and flavor, we conducted follow-up semi-structured interviews (N = 25) to explore participants' knowledge, attitudes, and perceptions of a low nicotine product standard and their anticipated tobacco use behavior after policy implementation. Interviews were audio-recorded, transcribed verbatim, double-coded, and analyzed using reflexive thematic analysis. Nearly half of participants supported the policy because they thought it would prevent young people from starting smoking and/or would help people quit. Reasons some participants opposed the policy included beliefs that adults should have the choice to smoke or that a nicotine reduction policy is counterintuitive because the government benefits from cigarette sales. Others believed the policy would be ineffective because youth could circumvent the policy (e.g., illicit market) or would increase their smoking to maintain the same nicotine level. Almost half of participants said they would quit smoking while the other half said they would continue smoking, although potentially reduce their smoking. Overall, our qualitative findings point to the need for pre-policy media campaigns targeting AYA who smoke to minimize negative reactions, dispel fears, and correct misperceptions as well as encourage quitting and provide information on accessing cessation resources.

Manipulation of Menthol and Nicotine Content in Cigarettes: Effects on Smoking Behavior and Toxicant Exposure in Women Menthol Smokers

BACKGROUND

The purpose of this study was to determine the effects of smoking and other outcomes of assigning cigarettes with reduced nicotine and/or no menthol to female menthol smokers.

AIMS AND METHODS

Nontreatment-seeking female menthol smokers (N = 263) participated in a randomized controlled trial in which levels of menthol and nicotine in cigarettes were manipulated using experimental cigarettes. After a baseline period, participants were assigned to the following conditions for 6 weeks: (1) their own brand of cigarette (conventional nicotine with menthol), (2) a conventional nicotine cigarette with no menthol, (3) a cigarette with reduced nicotine (RNC) with menthol, or (4) a RNC cigarette and no menthol. Participants then returned to using their own brand and were followed for another 6 weeks. Outcomes included cigarettes smoked, biomarkers of exposure, and dependence measures.

RESULTS

Results indicated that, after an initial increase, rates of smoking of all three experimental cigarettes were at or below baseline rates of smoking of one's own brand. Levels of biomarkers also decreased during the experimental phase but rebounded somewhat after participants resumed smoking their own brand. There was evidence that the overall amount of smoking decreased similarly among women who switched to non-menthol and/or RNC cigarettes.

CONCLUSIONS

These results suggest that no detrimental effect will occur in nicotine or toxicant exposure levels with a ban on characterizing menthol and/or a product standard on nicotine content in cigarettes.

IMPLICATIONS

The implication of this work is that there would be no risk to women menthol smokers associated with regulations restricting nicotine and eliminating menthol in cigarettes.

Subjective experiences, contexts, and risk perceptions of very low nicotine content cigarettes and electronic cigarettes among people with depression and anxiety disorders who smoke

BACKGROUND

A low-nicotine product standard is currently under consideration by the U.S. Food and Drug Administration (FDA). This standard may be more effective if alternative, non-combusted sources of nicotine are concurrently available. This qualitative study explored the lived experiences of people with depression and anxiety disorders who used very low nicotine content (VLNC) cigarettes with or without e-cigarettes during a randomized controlled trial.

METHODS

We conducted semi-structured qualitative interviews with participants (n = 20) as they completed a 16-week blinded trial of VLNC cigarettes with or without electronic cigarettes. Interviews explored 1) experiences with these products, 2) social and environmental contexts for use and 3) relative risk perceptions. Interviews were transcribed and analyzed using a hybrid inductive and deductive thematic analysis.

RESULTS

Concurrent access to e-cigarettes helped to ease the transition from usual-brand cigarettes to VLNC cigarettes. Some participants held misperceptions that VLNC cigarettes could reduce cancer risk whereas others did not. Participants expressed skepticism about the safety of e-cigarettes and the authenticity of the VLNC cigarettes. Smoking restrictions influenced e-cigarette use in some instances, but product preference was the overriding factor that influenced use. Participants did not note effects on psychiatric symptoms.

CONCLUSIONS

Should a nicotine reduction policy be implemented with e-cigarettes concurrently available on the market, tailored messaging for people with anxiety and depression disorders may be necessary to educate people about and the availability of alternative sources of nicotine, such as e-cigarettes, as well as the relative risk of VLNC cigarettes and e-cigarettes.

Effects of very low nicotine content cigarettes on smoking across vulnerable populations

There has been long-standing interest in a reduced-nicotine product standard for combusted tobacco, which is within the regulatory purview of the Food and Drug Administration (FDA). In weighing whether to establish this standard, it is important to consider potential responses among people who are at elevated risk for tobacco-related health harms. In this narrative review, we summarize studies of very low nicotine content (VLNC) cigarettes conducted between 2010 and 2021 in groups that the FDA has identified as vulnerable populations. Studies conducted to date in adults with mental health conditions, adults with opioid use disorder, socioeconomically-disadvantaged adults, and youth or young adults indicate that immediate switching to VLNC cigarettes decreases smoking, with minimal or no unintended negative consequences. Few studies have investigated the effects of VLNC cigarettes in racial or ethnic minorities, people who smoke menthol cigarettes, and pregnant women, but initial findings suggest that responses of these individuals are similar to responses observed in other vulnerable populations. We are not aware of studies that have investigated VLNC cigarettes in military/veteran populations, sexual or gender minority individuals, or people living in underserved rural environments. Future research directions include understanding how to promote cessation in the context of a reduced-nicotine standard, and how to correct VLNC misperceptions in vulnerable populations. Nevertheless, the evidence to date indicates that a reduced-nicotine standard is likely to have the same beneficial effects on smoking reductions as it does in less vulnerable populations, which should provide some confidence in pursuing this regulatory approach.

Effect of menthol on nicotine reduction: Pooled results from two double-blind randomized controlled trials

BACKGROUND

Menthol upregulates nicotinic acetylcholine receptors and is associated with tobacco dependence. The effects of menthol when smoking cigarettes with varying low nicotine content up to 98 % (e.g., non-addicting) less than commercial cigarettes is not well understood. The U.S. Food and Drug Administration is considering two tobacco product standards in cigarettes including banning menthol and reducing nicotine content. These new standards have the potential to significantly reduce smoking initiation and maintenance by limiting the mechanistic effects of nicotine and menthol on the brain.

METHODS

We conducted two parallel randomized clinical trials of gradually reduced nicotine in cigarettes from 11.6 mg down to 0.2 mg nicotine/cigarette (very low nicotine content; VLNC) vs. usual nicotine content (11.6 mg; UNC) over an 18-week period in people who smoke cigarettes with low socioeconomic status (SES) and mental health conditions.

RESULTS

Compared to UNC, VLNC was associated with significant reductions in cotinine, cigarettes per day, expired carbon monoxide levels, nicotine dependence and symptomology. These associations did not differ between menthol and non-menthol cigarettes, except people who smoke menthol cigarettes had less of a cotinine reduction in the SES trial. The pooled odds ratio of being adherent with using only VLNC study cigarettes in the gradual nicotine reduction arm for people who smoke non-menthol vs. menthol cigarettes was 2.6 (95 % CI:1.0, 6.4; p-value: 0.04).

CONCLUSIONS

When nicotine is lowered to non-addicting levels, the results indicate an independent effect of menthol on the need to sustain nicotine intake in addicted people who smoke cigarettes.

'It brings light to what you really put into your body': a focus group study of reactions to messages about nicotine reduction in cigarettes

OBJECTIVE

In 2017, the US Food and Drug Administration (FDA) announced a proposed regulation to lower nicotine in cigarettes to minimally addictive levels to help smokers quit. We sought to explore effective message strategies communicating about nicotine reduction in cigarettes across the different key audiences that the regulation is most likely to influence.

METHODS

We designed four types of messages: efficacy messages, risk messages, a message about alternative sources of nicotine and a compensation message. Sixteen virtual focus groups were conducted in Atlanta and San Francisco in April-May 2020. Data were analysed in NVivo 12.0 using a thematic analysis approach.

FINDINGS

Exclusive smokers were receptive to both efficacy messages and risk messages. Dual users were the only group that was open to resorting to alternative sources of nicotine. Former smokers were critical of these messages as promoting the new kinds of cigarettes and potentially encouraging initiation and relapse of smoking. Non-smokers felt that efficacy messages downplayed the risks of smoking and did not scare people away from smoking. Presenting information that very low nicotine cigarettes (VLNCs) still contain harmful chemicals made smokers question continued smoking in the absence of nicotine and view VLNCs as harmful.

CONCLUSIONS

Messages communicating about nicotine reduction in cigarettes might help to motivate smokers to quit and can correct the misperceptions that VLNCs are less harmful. The FDA should consider specific target audiences and use different messages that complement each other in communicating about this regulation.

Menthol preference moderates the relationship between cigarette nicotine content choice and reactions in young adults who smoke infrequently

BACKGROUND

Half of young adults who smoke use menthol cigarettes, which is associated with continued smoking and greater nicotine dependence. Additionally, early subjective reactions to cigarettes predict future use. Menthol may blunt the sensory effects of nicotine. We investigated the moderating role of menthol on subjective reactions to, and choice of varied nicotine content cigarettes in young adults who smoke infrequently.

METHODS

In three counterbalanced, double-blinded sessions, young adults who smoke ≤ 15 days/month smoked fixed doses from very low (VLNC), intermediate (INC), and normal (NNC) nicotine content cigarettes, which were menthol or non-menthol depending on preference. Participants chose their preferred cigarette in a final session. Positive and negative subjective reactions were measured in each session. ANOVA tests investigated the relationship between menthol preference, nicotine content, and subjective reactions.

RESULTS

Participants (N = 87) were 18-25 years old and reported smoking 15.2 cigarettes per month over 8 days (35 % menthol). Non-menthol preferring participants had increased negative reactions with greater nicotine content (F(1, 55)= 10.76, p < .001); menthol preferring participants did not. Choice of higher nicotine cigarettes was associated with having reported a greater difference in positive reactions to NNC and VLNC for non-menthol preferring participants (F(1, 55)= 12.72, p < .001) but not for menthol preferring participants.

CONCLUSIONS

Young adults who smoke infrequently are a priority tobacco control population given their high risk of transitioning to daily smoking. Results from this study in the form of subjective reactions indicate that a menthol ban is required for a nicotine reduction standard to be maximally effective in this vulnerable group.

Predictors of Adherence Among Vulnerable Populations of Adults Assigned to Smoke Very Low Nicotine Content Cigarettes

INTRODUCTION

Regulators are considering reducing the nicotine content in cigarettes to a minimally addictive level. This could particularly benefit smokers from populations vulnerable to heavy smoking and difficulties quitting. We assessed predictors of adherence among adults from vulnerable populations assigned to use very low nicotine content cigarettes (VLNCs) in randomized clinical trials, to identify characteristics of those who require additional assistance if a nicotine reduction policy were implemented.

AIMS AND METHODS

Data came from three populations of vulnerable adult smokers assigned to use VLNC cigarettes (0.4 mg/g nicotine) during 12-week randomized controlled trials (n = 286): Socioeconomically disadvantaged women of reproductive age, opioid-maintained adults, and adults with affective disorders. Logistic and linear regressions modeled predictors of adherence based on changes in cotinine at week-6 and week-12 assessments relative to baseline, and as a 90% reduction in cotinine relative to baseline (full adherence: yes/no). Predictors included satisfaction with study cigarettes, craving, nicotine dependence severity, withdrawal, population membership, baseline affective-disorder symptoms, and sociodemographic characteristics.

RESULTS

Dependence severity was negatively associated with both adherence measures at week 6 (p < .01), whereas increased satisfaction with study cigarettes and age were positively associated with both measures at weeks 6 and 12 (p < .01). Opioid-maintained adults exhibited reduced adherence and were less likely to reach full adherence at week 12 compared to disadvantaged women (p = .02).

CONCLUSIONS

Factors associated with VLNC adherence in vulnerable populations are similar to those in the general population of smokers. Furthermore, studies are indicated investigating nicotine supplements (e.g., e-cigarettes, NRT) to support highly dependent adults faced with using VLNCs.

IMPLICATIONS

This study identified factors predicting difficulty maintaining adherence to a regimen of very low nicotine content cigarettes (VLNC) among adults from vulnerable populations. Findings suggested that factors predicting difficulty maintaining adherence (greater nicotine dependence and low satisfaction with study-provided VLNC) were common across vulnerable smokers and the general population of adults who smoke. Furthermore, research should investigate alternatives to support highly dependent adults, such as pairing VLNC with supplemental, noncombusted nicotine. Some vulnerable populations (e.g., opioid-maintained adults) may be especially in need of supplemental, noncombusted nicotine.

Substance use and abuse in pediatric transplant recipients: What the transplant provider needs to know

Substance abuse is infrequently addressed during pre- and post-transplant care. However, the significant increase in the use of nicotine- and marijuana-containing products in the general and transplant adolescent population is concerning. In addition, alcohol use/abuse remains prevalent in the US population as it is highly accessible. Pediatric transplant providers should be prepared to screen for the use of any of these substances (eg, alcohol, nicotine, marijuana, cocaine, opiates, amphetamines) and to counsel them about the dangers of substance use and abuse including the unique dangers of the substances as a transplant recipient. Formal screening tools (in children as young as 9 years) should always be used as casual assessment of substance abuse has a high failure rate. This review summarizes the substances most commonly used in adolescent transplant recipients and the approach that transplant providers should take in order to prevent, decrease, or halt use in this patient population.

Comparison between Gradual Reduced Nicotine Content and Usual Nicotine Content Groups on Subjective Cigarette Ratings in a Randomized Double-Blind Trial

In 2018, the United States Food and Drug Administration (FDA) issued an advanced notice of proposed rulemaking to reduce nicotine in tobacco products to produce a minimally addictive or nonaddictive effect, but there was a research gap in the subjective responses of reduced-nicotine-content cigarettes. We compared the responses of the modified cigarette evaluation questionnaire (mCEQ) and cigarette-liking scale (CLS) between the gradually reduced nicotine content (RNC) group and the usual nicotine content (UNC) group. Linear mixed-effects models for repeated measures were used to analyze and compare the change over time for the mCEQ and CLS across the two treatment groups (RNC and UNC). We found that the change over time for the mCEQ and CLS was significant between the RNC and the UNC treatment groups at the beginning of visit 6 with 1.4 mg nicotine/cigarette. At visits 8 and 9, the RNC group reported significantly lower satisfaction scores compared to UNC. Subscale analysis showed that smoking satisfaction decreased in RNC while other measures, such as cigarette enjoyment, did not change. Understanding the impact of nicotine reduction on cigarette subjective responses through evaluation and liking scales would provide valuable information to the FDA on nicotine reduction policies for cigarettes.

Nicotine Standards in the United States

This Special Issue on nicotine standards in the United States will address many of the questions raised in the Advance Notice of Proposed Rulemaking (ANPRM) through a series of policy commentaries and timely empirical studies across a variety of topic areas within the proposed comprehensive nicotine standards plan. The questions addressed in this issue include: (1) the threshold dose of nicotine (and other constituents) that would lead to minimally addictive cigarettes; (2) the effects of a nicotine product standard in smokers with co-morbidity, youth and young adult smokers, and menthol smokers; (3) a step-down or targeted data approach to reducing nicotine in cigarettes; (4) perceptions and communications about product standards; and (5) requirements associated with the implementation of a nicotine product standard.

Anticipated Effects of Nicotine Reduction on Youth Smoking Initiation and Maintenance

This commentary summarizes emerging findings on the potential impact of a nicotine reduction policy on youth and young adults. We conclude that: (1) adolescent smokers and nonsmokers alike are likely to be less sensitive to reinforcement from very low nicotine content (VLNC) cigarettes compared with adults; (2) reducing nicotine in cigarettes to 0.4 mg/g would reduce the abuse potential of cigarettes in adolescents and young adults; (3) findings to date do not support concerns that nicotine reduction leads to compensatory smoking in young smokers; and (4) if the scope of a reduced nicotine product standard were applied to all combusted tobacco products, that would likely maximize public health benefit of this policy.