Patienter der var stoppet med at ryge ved uge 12 blev derefter randomiseret til at få enten CHAMPIX (1 mg 2 gange dagligt) eller placebo i yderligere 12 uger i en total forsøgsperiode på 52 uger.
Patients who stopped smoking by Week 12 were then randomized to receive either CHAMPIX (1 mg twice daily) or placebo for an additional 12 weeks for a total study duration of 52 weeks.