Figure 2.

For each group, the estimated number of cigarettes smoked per smoking day is graphed. Panel A depicts the relationship with regard to the number of drinks consumed on the same day. Group differences were not significant. Panel B depicts trends over time. Compared to stable infrequent smokers (whose increase is not statistically significant), increasing infrequent smokers (group 2) increased not just their smoking frequency but also their smoking quantity, while frequent smokers (group 5) decreased their number of cigarettes smoked per day. These estimates were adjusted for type of weekday, race (non-Hispanic White vs. other), institution attended, and precollege smoking frequency.