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. 2014 May 24;14:500. doi: 10.1186/1471-2458-14-500

Figure 1.

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.