Multidirectional Pathways of Tobacco and Marijuana Use, Including Comorbid Use, Among Young Adults (Aged 18-25 Years) in Texas: A Six-Wave Cross-Lagged Model

Associations for subgroups of E-cigarette, cigarette, and cannabis use with asthma in a population sample of California adolescents

Knowledge about the respiratory health consequences of adolescents' use of tobacco products with cannabis remains limited. We studied whether e-cigarettes, combustible cigarettes, and cannabis were independently associated with asthma in a population-based sample of 150,634 public high school students (10th and 12th graders), drawn in a two-stage design to be representative of the state of California in 2019-2020. Measures were obtained for use of e-cigarettes, combustible cigarettes, and cannabis; motives for use (three substances); method of use (for cannabis); ever being diagnosed with asthma; and having an asthma attack in past 12 months. Cross-classification indicated Nonuse for 64% of the sample; 15% Dual E-cigarette/Cannabis Use; 10% Exclusive Cannabis Use; 5% Exclusive E-cigarette Use; and 5% Triple Use. Multinomial logistic regression with a three-level criterion variable, controlling for age, sex, parental education, race/ethnicity, and three types of household use showed that compared with Nonuse, odds of Lifetime Asthma (vs. Never Had) was elevated for Triple Use (AOR = 1.14, CI 1.06-1.24), Dual E-cigarette/Cannabis Use (1.17, 1.12-1.23), Exclusive Cannabis Use (1.17, 1.11-1.23), and Exclusive E-cigarette Use (1.10, 1.02-1.18). Similar results were noted for Recent Asthma. Among persons who had used cannabis, 88% of the Triple group and 74% of the Dual E-cigarette/Cannabis group reported both smoking and vaping cannabis. Thus, co-occurrence of e-cigarette and cannabis use was a common pattern among adolescents in this study, and subgroups of cannabis and e-cigarette use showed similar associations with asthma. Preventive approaches should highlight the health implications of exclusive or combined e-cigarette and cannabis use.

Use of Inhaled Nicotine and Cannabis Products among Adults Who Vape Both Substances

BACKGROUND

Co-occurring use (co-use) of nicotine and cannabis is common, and represents a broad range of use behaviors, including concurrent use, sequential use, and co-administration. Co-use has primarily been examined through the lens of smoked tobacco and cannabis. Little is known about those who co-use vaped nicotine and cannabis, and the degree to which specific co-use behaviors are associated, based on mode of use and/or substance.

METHODS

We conducted an online pilot survey on use behaviors related to inhaled modes of nicotine and cannabis. The survey was administered to 112 concurrent vapers of these substances. Descriptive analyses examined sample characteristics and co-administered vaping and smoking behaviors. Logistic regressions examined associations in use behaviors by mode and substance.

RESULTS

Participants who vaped nicotine and cannabis monthly also reported monthly smoking of cannabis (100%), and cigarettes (58%). Most exhibited moderate-to-high degrees of mental health and substance use problems requiring clinical intervention. Monthly concurrent use exhibited more differences by mode, and more similarities by substance. Specific sequential use practices showed mode-specific associations; with greater frequency of cigarette smoking and nicotine vaping. Co-administration was associated with more frequent tobacco and cannabis smoking.

CONCLUSIONS

Those who regularly vape nicotine and cannabis tend to engage in some form of smoking. Different subsets of nicotine and cannabis co-use behaviors showed different associations with patterns of use and modes of drug delivery. Findings underscore the diversity of nicotine and cannabis use behaviors among co-users, and the importance of considering associations by both substance and mode of use.

[Electronic nicotine delivery systems in Brazilian state capitals: prevalence, profile of use, and implications for the National Tobacco Control Policy]

The objectives of this study were to estimate the prevalence of use of electronic nicotine delivery systems (ENDS) and to explore the potential impact of ENDS use on smoking initiation with conventional cigarettes. We used data from the Risk and Protective Factors Surveillance System for Chronic Non-Comunicable Diseases Through Telephone Interview (Vigitel), 2019 edition, which interviewed 52,443 individuals 18 years or older in Brazil's 26 state capitals and the Federal District. Point prevalence rates and confidence intervals (95%CI) were calculated for current and ever use of ENDS in each state capital, and the profile of ENDS users were described. Prevalence of lifetime use was estimated at 6.7% (95%CI: 6.13-7.27) and current use at 2.32% (95%CI: 1.97-2.68). A total of 2.4 million individuals had used ENDS any time in life, and 835,000 were currently using them. Approximately 80% of persons who had used ENDS were 18 to 34 years-old. Prevalence rates for daily use and dual use in individuals aged 18 to 24 years were nearly 10 times than prevalence in the older age groups. More than half of individuals who had ever used ENDS were never smokers. The proportion of women and individuals with high educational level were higher in the group of young people who only used ENDS than among those who only smoked conventional cigarettes. ENDS users also presented a higher proportion of binge drinking. Our findings are opposite to the tobacco industry's argument that the target public for ENDS is adult smokers. Considering that groups purportedly less prone to using conventional cigarettes are experiencing initiation with ENDS, our findings call attention to the possible negative impact of the dissemination of ENDS on Brazil's successful experience in the fight against tobacco.