Figure 1.

CONSORT Diagram

^aTo increase enrollment of racial/ethnic minorities and men, some nonminorities and women who were eligible for study enrollment were randomly selected to be excluded. Retention rates (%) were calculated as the number of participants who completed study data collection at each follow-up time point (3, 6 and 12-months) out of the total number of participants included in the imputed missing as smoking analysis. The missing as smoking analysis assumes that data are missing not at random, and that those who were lost to follow-up failed to quit.