Current smokers were defined as smokers at the time of the interview. Former smokers were defined as those who had previously smoked, but had not done so for a year or more. The remaining participants were defined as occasional or non-current smokers.
Current smokers weredefined as smokers at the time of the interview. Former smokers weredefined as those who had previously smoked, but had not done so fora year or more. The remaining participants were defined as occasionalor non-current smokers.