Concurrent Use of Cigarettes and Smokeless Tobacco among US Males and Females

Figure 1

Analysis framework for different comparison groups. Comparisons: (1) CiST versus nonusers of tobacco, (2) within subgroup “a” (CiST versus exclusive smokers), and (3) within subgroup “b” (CiST versus exclusive ST users). *Exclusive smokers (daily or someday), ^†exclusive ST users (daily or someday), CiST: concurrent users of cigarettes, and ST a: all smokers (exclusive and dual users) and b: all ST users (exclusive and dual users).