Figure 1

Percentage of samples in each smoking category by drinking and binge drinking status. Note. Occasional smokers smoked on 1–19 of the past 30 days; regular smokers smoked on ≥ 20 days in the past 30 days. Occasional drinkers drank alcohol on 1–9 of the past 30 days; frequent drinkers drank on ≥ 10 days in the past 30 days. Occasional binge drinkers reported binge drinking on 1–9 of the past 30 days; frequent binge drinkers reported binge drinking on ≥ 10 days in the past 30 days.