tobacco free policy All campuses to be tobacco-free

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Adult respondents who reported ever cigarette smoking, defined as smoking at least 100 cigarettes in their lifetime, were asked, How old were you when you first started smoking cigarettes fairly regularly? Responses were used to create 2 separate variables: one with 3 categories, which included adults who never smoked, those who began smoking before age 15 (childhood smoking), and those who began smoking after age 15

We excluded 4,480 records from our analysis according to our pre-determined exclusion criteria (Supplementary Information 1.2)

Poison imagery is a vivid way to highlight influence and boundary issues