At each survey, youth reported the number of days in the past 30 days in which they (1) drank alcohol; (2) smoked cigarettes; (3) used an electronic nicotine delivery system; (4) smoked a cigar/hookah/pipe; (5) used smokeless tobacco/chew/snus; (6) used a cannabis product (flower/concentrate/edible); (7) used prescription drugs in a way not prescribed; (8) used inhalants; or (9) used any other drugs. The response scale ranged from 0 days to 10+ days; for analysis, responses were dichotomized into no use versus any use. Responses were collapsed across items (2)-(5) to form an indicator of nicotine use and across items (1)-(9) to form an indicator of use of any substance. In addition, we analyzed vaping of nicotine as its own category given previous findings specific to this format [24].
