Subjects who have quit smoking (usually about 44% of those who receive Champix and 15% of those who receive IVR) will be equally randomized into 2 groups matched by level of motivation (a score of 7 or higher - question #30, pg. 5 of questionnaire) and level of addiction (a score of 7 or higher - question #17 - #24, pg. 3 - 4 of questionnaire). Randomization will be done by manual calculation of these two scores.