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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: Eval Program Plann. 2011 Dec 13;35(3):321–328. doi: 10.1016/j.evalprogplan.2011.12.001

Figure 1. PDES Model of Smoking Behavior Progression for NSDUH Survey.

Figure 1

Note: NS = Never-smoker, CS = Current smoker, and XS = Ex-smoker. σi (i=1, 2, …6) are probabilities describing the rapidity at which one type of smokers remaining at the same stage or progress from one stage to another during one year period.