Substance consumption frequency increased across waves. Examining the ‘have consumed’ categories, very few participants endorsed smoking often (2%), becoming intoxicated often (1.1%) or having used an illicit drug (1.1%) at age 13–14. At age 16–17, more participants reported alcohol intoxication sometimes (35.1%) and often (25%) compared to smoking sometimes (14%) or often (8%). Five percent of the sample reported illicit drug use at this age. Finally, at age 19–20, 15% of participants reported smoking sometimes, 12% reported smoking often, 47% reported intoxication sometimes, and 41% reported drinking to intoxication often. Illicit drug use rates more than doubled at this age to 13.3%.
