Duration of Follow-Up Counselling on Smoking Cessation Outcomes

Inclusion Criteria: * Current smokers among outpatients, including hospital employees, who provide informed consent for enrollment in the smoking cessation program Exclusion Criteria: * Subjects who decline smoking cessation or who do not provide informed consent * Subjects who are participating or will be participating in other smoking cessation programs within the next six months * Subjects who are currently using smoking cessation medications * Subjects who cannot be followed up for at least six months, for instance, subjects who would be resigning and going overseas within the next six months * Subjects with language limitations that would impede completion of self-administered questionnaires * Subjects who are difficult to communicate with over the telephone (e.g. having speech or hearing problems) * Subjects with cognitive impairments that would impede counselling and follow-up * Subjects with no telephone number * Subjects who are too sick to receive smoking cessation counselling * Subjects with limited life expectancy (e.g. metastatic cancer)