Abstinence was calculated in two ways, at each postquit time point (session) and at end of treatment (EOT). Session abstinence was calculated independently for each of the three postquit time points (1–2 days, 3–5 days, and 10 –14 days postquit), with session abstinence at any given time point being defined as no reported cigarettes smoked since the last time point (since quit date for Session 2, the 1–2 day postquit time point) and an expired CO ≤10 ppm. Missing data points were coded as smoking. EOT abstinence was calculated at the final time point (Session 4; 10 –14 days postquit). A participant was considered an abstainer at EOT if he or she reported smoking no cigarettes, not even a puff, from the quit date to Session 4.2 Session abstinence was confirmed, using expired CO (≤10 ppm), at postquit Sessions 2, 3, and 4. Relapsers were those who relapsed to smoking by one of the time points subsequent to the quit date. Table 2 depicts abstinence frequencies at EOT and for each session. In terms of cigarettes smoked per day, relapsers
