Fig. 1

Life course smoking patterns among ever (A) and former (B) smokers. a. Among ever smokers: Pattern A, characterized by males who reported low and constant smoking intensity (87.8%) and Pattern B, males with an initial period of low smoking intensity, followed by an increase during the second period (12.2%). b. Among former smokers: Pattern A, characterized by males who reported a low and constant smoking intensity (88.7%) and Pattern B, males with an initial period of low smoking status, followed by an increase during the second period (11.3%)