 Demographic and personal chrematistics of the patients including age, sex, average number of cigarette smoked per day will be recorded. Patients will then receive a questionnaire based on Prochaska and DiClementes Stages of Change Model to determine whether they were precontemplating, contemplating, preparing for or actively engaged in smoking cessation. In order to have the baseline smoking status, urinary cotinine and expired-air carbon monoxide COE will be measured in all patients at the preadmission clinic. 