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Figures
Fig. 1: Flow of participants through the study. NDIT = McGill University Study on the Natural History of Nicotine Dependence in Teens.
Fig. 2: Cumulative probability of attaining milestones of onset of cigarette smoking from time since initiation among 311 participants who were nonsmokers at baseline and who initiated cigarette smoking during follow-up. See Methods for definitions of the milestones. *Thirty-six subjects reported mental addiction and 15 reported physical addiction before initiation. These subjects were considered to be incident cases at baseline; they contributed zero person-months to the denominator in the computation of time at risk for selected milestone.
Fig. 3: Number of months after initiation of cigarette smoking (first puff) at which the probability of attaining each milestone is 25%. Error bars represent 95% confidence intervals. (See Methods for definitions of the milestones.)