Comparison of toxicant load from waterpipe and cigarette tobacco smoking among young adults in the USA

Natural Course of Nicotine Dependence Among Adolescent Waterpipe and Cigarette Smokers

PURPOSE

Waterpipe (WP) smoking patterns and setting can result in a unique trajectory of nicotine dependence (ND) compared with cigarette smoking. This longitudinal study compared the development of ND symptoms among adolescent WP and cigarette smokers.

METHODS

A cohort of 647 eighth and ninth graders in Lebanon were followed over 5 years. This study was based on 283 current exclusive WP and 146 current exclusive cigarette smokers. Kaplan-Meier survival analyses were conducted to evaluate 50% cumulative probability for the development of initial Hooked on Nicotine Checklist symptoms and the International Classification of Diseases, 10th revision (ICD-10) ND.

RESULTS

An initial Hooked on Nicotine Checklist symptom was endorsed by 59% of WP and 50% of cigarette smokers after smoking onset. Among those, 50% of both WP and cigarette smokers did so within 9.7 and 18.5 months, respectively. Approximately 28% of WP smokers and 22% of cigarette smokers developed ICD-10 ND. Among those, 50% of both WP and cigarette smokers did so within 15 and 22 months, respectively. The most common first to fourth ICD-10 criteria reported by WP smokers were "a strong desire to use tobacco," "difficulties in controlling tobacco taking behavior," "neglect of alternative pleasure," and "use despite harm." The most common first to fourth ICD-10 criteria reported by cigarette smokers were "a strong desire to use tobacco," "difficulties in controlling tobacco taking behavior," "withdrawal," and "tolerance".

CONCLUSIONS

Compared with adolescent cigarette smokers, initial ND symptoms and ICD-10 ND can develop sooner after starting to smoke and progress more rapidly among adolescent WP smokers. Developing, implementing, and evaluating intervention programs with adolescent WP smokers should be guided by the WP-specific trajectory of ND.

Waterpipe tobacco package warning exposure's impact on risk perceptions and use among young adults in the USA: a longitudinal analysis of the population assessment of tobacco and health study

BACKGROUND

Although Food and Drug Administration (FDA)-mandated waterpipe tobacco warnings were not required until August 2018, some waterpipe tobacco packaging (WTP) sold in the USA, contained warnings prior to this date. We examined the prevalence of WTP warning exposure and whether exposure influenced risk perceptions or use among young adult (aged 18-24 years) current waterpipe users.

METHODS

We used data from waves 1 (2013-2014) and 2 (2014-2015) of the Population Assessment of Tobacco and Health Study, a nationally representative longitudinal study of US adults and youth. We conducted logistic regression analyses to identify factors associated with wave 1 warning exposure, and whether wave 1 WTP warning exposure predicted wave 2 relative risk perceptions and waterpipe use.

RESULTS

More than one-third of our sample (35.9%, 95% CI 33.5 to 38.4) reported past-month WTP warning exposure. Exposure was higher among males (adjusted OR (AOR)=1.34, 95% CI 1.04 to 1.72), those who usually do not share the waterpipe (AOR=3.10, 95% CI 1.45 to 6.60), those who purchased waterpipe tobacco (AOR=1.73, 95% CI 1.28 to 2.34), and those with a regular brand (AOR=1.84, 95% CI 1.26 to 2.68). Those exposed to WTP warnings at wave 1 were more likely than those not exposed to perceive waterpipe tobacco to be as or more harmful than cigarettes at wave 2 (AOR=1.35, 95% CI 1.02 to 1.78). There was no association between wave 1 WTP exposure and wave 2 waterpipe use.

CONCLUSIONS

More than one-third of US young adult current waterpipe users reported WTP warning exposure prior to FDA-mandated warning implementation. Findings suggest the mandated warning may result in high exposure among users; it will be critical to assess exposure's impact on risk perceptions and behaviour after FDA-mandated warnings are implemented.