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Nicotine & Tobacco Research : Official... Oct 2021Cigarette smoking is disproportionately common among sexual minorities. While menthol market share has increased in the past decade, research on menthol cigarette...
INTRODUCTION
Cigarette smoking is disproportionately common among sexual minorities. While menthol market share has increased in the past decade, research on menthol cigarette smoking among sexual minorities is scant. For this study, we examined menthol cigarette smoking in the United States, by sex and sexual identity using a nationally representative sample of adults.
AIMS AND METHODS
We pooled data from the 2015-2019 National Survey on Drug Use and Health. We used chi-square tests and multivariable logistic regression models to examine (1) past 30-day cigarette use, (2) past 30-day menthol use, and (3) menthol preference among adults who have smoked cigarettes in the past 30 days for the following groups: heterosexual/straight males, heterosexual/straight females, gay males, gay/lesbian females, bisexual males, and bisexual females. Data were analyzed in September 2020.
RESULTS
Bivariate analyses revealed that prevalence of cigarette smoking and menthol cigarette smoking were higher among sexual minorities compared with heterosexual respondents, and that preference for menthol was highest among lesbian/gay and bisexual females who smoke. Multivariable models showed that compared with heterosexual females who smoke, odds of menthol preference were lower among heterosexual/straight and bisexual males who smoke, and higher among bisexual females.
CONCLUSIONS
Our study found that menthol preference was disproportionately high among sexual minorities who smoke-bisexual and gay/lesbian females who smoke in particular. Research is needed to understand why menthol use is common among sexual minorities who smoke.
IMPLICATIONS
Using data from a nationally representative study, this study makes a unique contribution to literature by identifying differences in menthol smoking between sexual minority subgroups. Specifically, we found that menthol smoking was highest among sexual minority females (ie, lesbian/gay and bisexual females) compared with other sexual minorities. These findings highlight the need for targeted interventions to prevent menthol cigarette initiation among sexual minorities, as well as to promote smoking cessation among sexual minorities who smoke menthol cigarettes, with an emphasis on sexual minority females. Future research should examine the impact of a potential menthol ban on these inequalities.
Topics: Adult; Cigarette Smoking; Female; Humans; Male; Menthol; Sexual and Gender Minorities; Smoke; Tobacco Use; United States
PubMed: 34255831
DOI: 10.1093/ntr/ntab101 -
Nicotine & Tobacco Research : Official... Oct 2020Youth cigarette smoking decreased significantly over the last two decades in the United States. This study provides estimates and trends from 2011 to 2018 and factors...
INTRODUCTION
Youth cigarette smoking decreased significantly over the last two decades in the United States. This study provides estimates and trends from 2011 to 2018 and factors associated with youth menthol and non-menthol smoking from 2016 to 2018.
METHODS
Using data from the 2011-2018 National Youth Tobacco Surveys, past 30-day (current) menthol and non-menthol cigarette smoking were estimated for all youth (prevalence) and youth smokers (proportions). Trends were examined using Joinpoint regression, calculating the annual percent change (APC). Multivariate logistic regression analyses identified factors associated with menthol smoking.
RESULTS
From 2011 to 2018, menthol cigarette smoking among current youth cigarette smokers significantly decreased from 57.3% to 45.7% (APC: -3.0%), while non-menthol (38.2% to 47.3% [APC: 2.9%]) and unknown menthol status (not sure\missing) (4.5% to 7.0% [APC: 7.1%]) significantly increased. Menthol cigarette smoking among high school, male, female, and non-Hispanic white current cigarette smokers decreased, but remained unchanged among middle school, non-Hispanic black, and Hispanic smokers. Significantly higher proportions of menthol cigarette smokers smoked on ≥20 days, ≥2 cigarettes per day, and ≥100 cigarettes in their lifetime compared to non-menthol smokers. Among current cigarette smokers, non-Hispanic blacks, Hispanics, flavored non-cigarette tobacco users, frequent smokers (≥20 days), those smoking 2-5 cigarettes per day, and those living with someone who uses tobacco had higher odds of menthol cigarette smoking.
CONCLUSIONS
In 2018, nearly half of current youth cigarette smokers smoked menthol cigarettes. While menthol cigarette smoking declined from 2011 to 2018 among all youth and among youth smokers, there was no change in menthol cigarette smoking among non-Hispanic black, Hispanic, and middle school cigarette smokers.
IMPLICATIONS
This study finds that overall cigarette and menthol cigarette smoking declined in youth from 2011 to 2018. However, menthol cigarette smoking among non-Hispanic black, Hispanic, and middle school youth cigarette smokers did not change. Information from this study can help inform efforts to reduce menthol cigarette smoking among US youth, particularly racial/ethnic minority populations.
Topics: Adolescent; Child; Cigarette Smoking; Ethnicity; Female; Humans; Male; Menthol; Prevalence; Schools; Smokers; Smoking Cessation; Students; Surveys and Questionnaires; United States
PubMed: 32347935
DOI: 10.1093/ntr/ntaa054 -
Chemosphere Jun 2020In this study, we determined DNA damage and chromosome breakage (indicators of genotoxicity) and cell viability (an indicator of cytotoxicity) in human lymphoblastoid...
In this study, we determined DNA damage and chromosome breakage (indicators of genotoxicity) and cell viability (an indicator of cytotoxicity) in human lymphoblastoid TK6 and Chinese hamster ovary (CHO) cells treated with 33 e-liquids using in vitro single cell gel (comet), micronucleus (MN), and trypan blue assays, respectively. We also measured the contents of nicotine, five phthalate esters, and DL-menthol in the e-liquids to examine their effects on DNA damage, chromosome breakage, and cell viability. Our chemical analyses showed that: (1) six e-liquids had nicotine ≥2-fold higher than the manufacture's label claim (2-3.5 mg); (2) both dimethyl- and dibutyl-phthalate levels were >0.1 μg/g, i.e., their threshold limits as additives in cosmetics; and (3) the DL-menthol contents ranged from 0.0003 to 85757.2 μg/g, with those of two e-liquids being >1 mg/g, the threshold limit for trigging sensory irritation. Though all the e-liquids induced DNA damage in TK6 cells, 20 resulted in cell viabilities ≤75%, indicating cytotoxicity, yet the inverse relationship between cell viability and DNA damage (r = -0.628, p = 0.003) might reflect their role as pro-apoptotic and DNA damage inducers. Fifteen e-liquids induced MN% in TK6 cells ≥3-fold that of untreated cells. Some of the increase in %MN might be false due to high cytotoxicity, yet six brands showed acceptable cell viabilities (59-71%), indicating chromosome damage. DNA damage and %MN increased when the TK6 cells were exposed to metabolic activation. The CHO cells were less sensitive to the genotoxic effects of the e-liquids than the TK6 cells. DL-menthol was found to be associated with decreased cell viability and increased DNA damage, even at low levels. We cannot dismiss the presence of other ingredients in e-liquids with cytotoxic/genotoxic properties since out of the 63 different flavors, 47 induced DNA damage (≥3-folds), and 26 reduced cell viability (≤75%) in TK6 cells.
Topics: Animals; CHO Cells; Cell Survival; Cricetinae; Cricetulus; DNA Damage; Dibutyl Phthalate; E-Cigarette Vapor; Esters; Humans; Menthol; Micronucleus Tests; Nicotine; Phthalic Acids
PubMed: 32058129
DOI: 10.1016/j.chemosphere.2020.126153 -
Respiratory Research Feb 2023Upper respiratory tract infections (URTIs) impact all age groups and have a significant economic and social burden on society, worldwide. Most URTIs are mild and... (Review)
Review
BACKGROUND
Upper respiratory tract infections (URTIs) impact all age groups and have a significant economic and social burden on society, worldwide. Most URTIs are mild and self-limiting, but due to the wide range of possible causative agents, including Rhinovirus (hRV), Adenovirus, Respiratory Syncytial Virus (RSV), Coronavirus and Influenza, there is no single and effective treatment. Over-the-counter (OTC) remedies, including traditional medicines and those containing plant derived substances, help to alleviate symptoms including inflammation, pain, fever and cough.
PURPOSE
This systematic review focuses on the role of the major plant derived substances in several OTC remedies used to treat cold symptoms, with a particular focus on the transient receptor potential (TRP) channels involved in pain and cough.
METHODS
Literature searches were done using Pubmed and Web of Science, with no date limitations, using the principles of the PRISMA statement. The search terms used were 'TRP channel AND plant compound', 'cough AND plant compound', 'cough AND TRP channels AND plant compound', 'cough AND P2X3 AND plant compound' and 'P2X3 AND plant compound' where plant compound represents menthol or camphor or eucalyptus or turpentine or thymol.
RESULTS
The literature reviewed showed that menthol activates TRPM8 and may inhibit respiratory reflexes reducing irritation and cough. Menthol has a bimodal action on TRPA1, but inhibition may have an analgesic effect. Eucalyptus also activates TRPM8 and inhibits TRPA1 whilst down regulating P2X3, aiding in the reduction of cough, pain and airway irritation. Camphor inhibits TRPA1 and the activation of TRPM8 may add to the effects of menthol. Activation of TRPV1 by camphor, may also have an analgesic effect.
CONCLUSIONS
The literature suggests that these plant derived substances have multifaceted actions and can interact with the TRP 'cough' receptors. The plant derived substances used in cough and cold medicines have the potential to target multiple symptoms experienced during a cold.
Topics: Humans; Transient Receptor Potential Channels; Menthol; Camphor; TRPM Cation Channels; TRPA1 Cation Channel; Cough; Pain; Analgesics
PubMed: 36755306
DOI: 10.1186/s12931-023-02347-z -
Evaluation Review Oct 2023California Proposition 56 increased the state tobacco tax by $2 per cigarette pack effective April 1, 2017. Between 2015-2020 San Francisco (SF) and some cities in...
California Proposition 56 increased the state tobacco tax by $2 per cigarette pack effective April 1, 2017. Between 2015-2020 San Francisco (SF) and some cities in Alameda County enacted local flavored tobacco sales restrictions. SF also increased its Cigarette Litter Abatement Fee, from $0.20/pack in 2015 to $1.00 in 2020. Compare the change in tobacco prices before (2015) and after (2019/20) the implementation of a $2 increase in tobacco excise tax and local flavored tobacco policies in SF and Alameda Counties. Descriptive study of the pre-to-post policy analysis design. We drew a proportional random sample of retailers (N=463) in SF and Alameda Counties, by city. Using multivariable, single- and multiple-level linear regressions, we compared inflation-adjusted average tobacco prices in 2015 vs. 2019/20 by county and by flavor policy, accounting for socio-demographics. Change in inflation-adjusted average tobacco prices in 2015 vs. 2019/20 by county and flavor policy, accounting for socio-demographics. Between 2015-2019/20, the increase in cigarette prices was higher than the $2 tax increase, and higher in SF than Alameda County (+$4.6 vs +$2.5). SF retailers stopped selling Newport menthol cigarettes and Blu brand menthol e-cigarettes in 2019/20. Adjusted average cigarette prices increased significantly more in SF and Alameda County cities with comprehensive or partial flavor policies versus cities without flavor policies (by $3.23 and $2.11). Local flavor policies affected menthol product availability and may have had positive spillover effects and indirectly increased pack prices.
Topics: Tobacco Control; San Francisco; Menthol; Electronic Nicotine Delivery Systems; Taxes; Commerce
PubMed: 36943027
DOI: 10.1177/0193841X231164908 -
Frontiers in Immunology 2023A complex network of interactions exists between the olfactory, immune and central nervous systems. In this work we intend to investigate this connection through the use...
Improvement of cognitive function in wild-type and Alzheimer´s disease mouse models by the immunomodulatory properties of menthol inhalation or by depletion of T regulatory cells.
A complex network of interactions exists between the olfactory, immune and central nervous systems. In this work we intend to investigate this connection through the use of an immunostimulatory odorant like menthol, analyzing its impact on the immune system and the cognitive capacity in healthy and Alzheimer's Disease Mouse Models. We first found that repeated short exposures to menthol odor enhanced the immune response against ovalbumin immunization. Menthol inhalation also improved the cognitive capacity of immunocompetent mice but not in immunodeficient NSG mice, which exhibited very poor fear-conditioning. This improvement was associated with a downregulation of IL-1β and IL-6 mRNA in the brain´s prefrontal cortex, and it was impaired by anosmia induction with methimazole. Exposure to menthol for 6 months (1 week per month) prevented the cognitive impairment observed in the APP/PS1 mouse model of Alzheimer. Besides, this improvement was also observed by the depletion or inhibition of T regulatory cells. Treg depletion also improved the cognitive capacity of the APP Alzheimer´s mouse model. In all cases, the improvement in learning capacity was associated with a downregulation of IL-1β mRNA. Blockade of the IL-1 receptor with anakinra resulted in a significant increase in cognitive capacity in healthy mice as well as in the APP/PS1 model of Alzheimer´s disease. These data suggest an association between the immunomodulatory capacity of smells and their impact on the cognitive functions of the animals, highlighting the potential of odors and immune modulators as therapeutic agents for CNS-related diseases.
Topics: Mice; Animals; Alzheimer Disease; Menthol; Amyloid beta-Protein Precursor; T-Lymphocytes, Regulatory; Mice, Transgenic; Cognition; Immunity
PubMed: 37187754
DOI: 10.3389/fimmu.2023.1130044 -
International Journal of Molecular... Jan 2023Flavorings enhance the palatability of e-cigarettes (e-cigs), with menthol remaining a popular choice among e-cig users. Menthol flavor remains one of the only flavors...
Flavorings enhance the palatability of e-cigarettes (e-cigs), with menthol remaining a popular choice among e-cig users. Menthol flavor remains one of the only flavors approved by the United States FDA for use in commercially available, pod-based e-cigs. However, the safety of inhaled menthol at the high concentrations used in e-cigs remains unclear. Here, we tested the effects of menthol on parameters of mucociliary clearance (MCC) in air-liquid interface (ALI) cultures of primary airway epithelial cells. ALI cultures treated with basolateral menthol (1 mM) showed a significant decrease in ciliary beat frequency (CBF) and airway surface liquid (ASL) volumes after 24 h. Menthol nebulized onto the surface of ALI cultures similarly reduced CBF and increased mucus concentrations, resulting in decreased rates of mucociliary transport. Nebulized menthol further increased the expression of mucin 5AC (MUC5AC) and mRNA expression of the inflammatory cytokines and . Menthol activated TRPM8, and the effects of menthol on MCC and inflammation could be blocked by a specific TRPM8 antagonist. These data provide further evidence that menthol at the concentrations used in e-cigs could cause harm to the airways.
Topics: Mucociliary Clearance; Menthol; Mucin 5AC; Electronic Nicotine Delivery Systems; Epithelial Cells
PubMed: 36675209
DOI: 10.3390/ijms24021694 -
Journal of Phycology Feb 2021Environmental change, including global warming and chemical pollution, can compromise cnidarian-(e.g., coral-) dinoflagellate symbioses and cause coral bleaching....
Environmental change, including global warming and chemical pollution, can compromise cnidarian-(e.g., coral-) dinoflagellate symbioses and cause coral bleaching. Understanding the mechanisms that regulate these symbioses will inform strategies for sustaining healthy coral-reef communities. A model system for corals is the symbiosis between the sea anemone Exaiptasia pallida (common name Aiptasia) and its dinoflagellate partners (family Symbiodiniaceae). To complement existing studies of the interactions between these organisms, we examined the impact of menthol, a reagent often used to render cnidarians aposymbiotic, on the dinoflagellate Breviolum minutum, both in culture and in hospite. In both environments, the growth and photosynthesis of this alga were compromised at either 100 or 300 µM menthol. We observed reduction in PSII and PSI functions, the abundances of reaction-center proteins, and, at 300 µM menthol, of total cellular proteins. Interestingly, for free-living algae exposed to 100 µM menthol, an initial decline in growth, photosynthetic activities, pigmentation, and protein abundances reversed after 5-15 d, eventually approaching control levels. This behavior was observed in cells maintained in continuous light, but not in cells experiencing a light-dark regimen, suggesting that B. minutum can detoxify menthol or acclimate and repair damaged photosynthetic complexes in a light- and/or energy-dependent manner. Extended exposures of cultured algae to 300 µM menthol ultimately resulted in algal death. Most symbiotic anemones were also unable to survive this menthol concentration for 30 d. Additionally, cells impaired for photosynthesis by pre-treatment with 300 µM menthol exhibited reduced efficiency in re-populating the anemone host.
Topics: Animals; Dinoflagellida; Menthol; Photosynthesis; Sea Anemones; Symbiosis
PubMed: 33025575
DOI: 10.1111/jpy.13081 -
European Journal of Sport Science Oct 2023We determined the effects of topically applied (i) isolated menthol cream, (ii) menthol and capsaicin co-application or (iii) placebo cream on exercise tolerance,... (Randomized Controlled Trial)
Randomized Controlled Trial
Topical application of isolated menthol and combined menthol-capsaicin creams: Exercise tolerance, thermal perception, pain, attentional focus and thermoregulation in the heat.
We determined the effects of topically applied (i) isolated menthol cream, (ii) menthol and capsaicin co-application or (iii) placebo cream on exercise tolerance, thermal perception, pain, attentional focus and thermoregulation during exercise in the heat. Ten participants cycled at 70% maximal power output until exhaustion in 35°C and 20% relative humidity after application of (i) 5% isolated menthol, (ii) 5% menthol and 0.025% capsaicin co-application or (iii) placebo cream. Thermo-physiological responses were measured during exercise, with attentional focus and pain determined post-exercise on a 0-to-10 scale. Across the three conditions, time to exhaustion was 13.4 ± 4.8 min, mean ± SD infrared tympanic and skin temperature was 37.2 ± 0.6°C and 35.1 ± 1.2°C, respectively, and heart rate was 152 ± 47 bpm, with no changes between conditions (> 0.05). Perceived exertion was lower in the isolated menthol all other conditions (< 0.05, = 0.44). Thermal sensation was higher in menthol-capsaicin co-application isolated menthol (< 0.05, 1.1), while sweat rate was higher for capsaicin and menthol co-application compared to menthol (< 0.05, = 0.85). The median and interquartile range scores for pain were lower (< 0.05) in the menthol condition (8, 7-8) compared to both menthol and capsaicin (10, 9-10) and placebo (9, 9-10), which was coupled with a greater distraction (< 0.05) in the menthol condition (9, 7-10) compared to placebo (6, 5-7). Despite no performance effects for any topical cream application condition, these data reiterate the advantageous perceptual and analgesic role of menthol application and demonstrate no advantage of co-application with capsaicin.Topical application of isolated menthol cream to cold-sensitive areas of the body during exhaustive exercise in the heat, elicited reduced perception of pain and enhanced sensation of cooling.While this reduction in generally unpleasant feelings (i.e. pain and heat) were coupled with lower RPE scores in the menthol condition and could be considered beneficial, there was no apparent ergogenic effect in an exercise tolerance test.Co-application of capsaicin and menthol appeared to inhibit the positive sensory effects elicited by menthol.Isolated menthol can induce changes in cognitive processes related to pain and exertion, while also reducing thermal sensation; however, the decision to use menthol creams must be balanced with the limited performance or thermoregulatory effects reported herein during exercise in hot environments.
Topics: Humans; Body Temperature Regulation; Capsaicin; Exercise Tolerance; Hot Temperature; Menthol; Pain; Pain Perception; Thermosensing; Cross-Over Studies; Male; Female; Adult
PubMed: 37161852
DOI: 10.1080/17461391.2023.2211966 -
American Journal of Health Promotion :... Nov 2022To describe patterns of menthol/non-menthol cigarettes with flavored e-cigarettes (tobacco, menthol, sweet/spicy, and other flavorings) use.
PURPOSE
To describe patterns of menthol/non-menthol cigarettes with flavored e-cigarettes (tobacco, menthol, sweet/spicy, and other flavorings) use.
DESIGN
We used cross-sectional data from the 2018-2019 Tobacco Use Supplement to the Current Population Survey (TUS-CPS).
SETTING
United States.
SUBJECTS
Adults over 18 years old.
SAMPLE
A nationally representative sample (n = 135 329).
MEASURES
We generated a 15-category variable of all combinations of cigarette and e-cigarette flavoring use.
ANALYSIS
We estimated population prevalence (PP) for the 15-category flavored cigarette and e-cigarette use variable and proportion of flavored cigarette and e-cigarette use among adults who used cigarettes or e-cigarettes (PAU) by age, sex, race/ethnicity, and income.
RESULTS
Exclusive menthol cigarette use was higher among NH Black (PP = 8.79%, PAU = 68.96%) and low-income (PP = 4.86%, PAU = 29.09%) compared to NH White (PP = 2.63%, PAU = 18.83%) and high-income participants (PP = 1.25%, PAU = 19.02%). Exclusive sweet/spicy e-cigarette use (PP = 1.32%, PAU = 10.22%) and exclusive menthol e-cigarette use (PP = .95%, PAU = 7.40%) was higher in younger (18-34) vs older (35+) adults (PP = .34% and PAU = 2.76%, and PP = .14%, PAU = 1.11%, respectively). Older dual users tended to combine the same flavor in both products (eg, menthol cigarettes + menthol e-cigarettes), while younger adults were more likely to combine menthol and non-menthol cigarettes with sweet/spicy e-cigarettes.
CONCLUSION
Findings suggest that a menthol cigarette ban might be most effective in conjunction with sweet/spicy e-cigarette flavor restrictions, given these flavors are attractive for younger adults.
Topics: Adult; Humans; United States; Adolescent; Electronic Nicotine Delivery Systems; Cross-Sectional Studies; Flavoring Agents; Tobacco Products; Vaping; Menthol
PubMed: 35499236
DOI: 10.1177/08901171221097682