Figure 1.

a. Estimated probability of abstinence (from 0, smoking, to 1, abstinent) from cigarettes by day for the first 27 days of a quit attempt assuming all smokers belong to a single latent class. The full sample (N=1433) with any post-quit smoking data was included in this analysis.

b. Estimated probability of abstinence (rho) from cigarettes by day for the first 27 days of a quit attempt, given latent class membership, in the unconditional 5-class model. Class prevalences are noted in parantheses below the class labels in the figure legend. The full sample (N=1433) with any post-quit smoking data was included in this analysis. Note that the Intermittent smoker classes are so named because daily abstinence probabilities in these classes are intermediate between abstinence and smoking, suggesting smoking on some but not all days. The Early Intermittent class is so named because smoking probabilities in this class suggest a reduction of smoking days beginning on the target quit day. The Late Intermittent class is so named because abstinence probabilities do not increase markedly in this class until the second week of the quit attempt.