Activities were coded into four categories: leisure (e.g., watching TV, at home, on the computer, and drinking coffee), performative (e.g., completing chores, driving, getting child ready for school), social (e.g., at a party, at a friends home, at the casino), and interactive (e.g., talking on the phone, arguing with another, business calls, and having a conversation)
What Does the National Youth Tobacco Survey Reveal about High School Ecigarette Use in the USA?, Qeios preprint, submitted October 7, 2019
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Studies in which more frequent or chronic use of e-cigarettes is associated with proportional differences in combustible tobacco use initiation or progression in frequency, intensity, or duration provided further support of causation