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BACKGROUND AND OBJECTIVES: Noncigarette tobacco use is increasing. In this study, we reexamined (1) parental knowledge or suspicion of their children’s tobacco use and (2) associations of household tobacco-free rules with youth initiation. METHODS: Participants were youth (aged 12–17) in waves 1 to 4 (2013–2018) of the Population Assessment of Tobacco and Health Study. A pseudo cross-sectional time-series analysis (N = 23 170) was used to examine parent or guardian knowledge or suspicion of their child’s tobacco use according to youth-reported use categories: cigarette only, electronic cigarette only, smokeless tobacco only, noncigarette combustible only, and poly use. A longitudinal analysis among wave 1 never users (n = 8994) was used to examine rules barring tobacco inside the home and whether parents talked with youth about not using tobacco as predictors of youth tobacco initiation after 1 to 3 years. Survey-weighted multivariable models were adjusted for tobacco use risk factors. RESULTS: In all waves, parents or guardians much less often knew or suspected that their children used tobacco if youth only reported use of electronic cigarettes, noncigarette combustible products, or smokeless tobacco compared with cigarettes. Youth tobacco initiation was lower when youth and parents agreed that rules prohibited all tobacco use throughout the home (1-year adjusted odds ratio: 0.74; 95% confidence interval: 0.59–0.94) but not when parents talked with youth about tobacco (adjusted odds ratio: 1.08; 95% confidence interval: 0.94–1.23). CONCLUSIONS: Many parents are unaware of their children’s noncigarette tobacco use. Setting expectations for tobacco-free environments appears more effective at preventing youth tobacco initiation than parents advising children not to use tobacco.

Parental Awareness of Youth Tobacco Use and the Role of Household Tobacco Rules in Use Prevention