Immediate and delayed effects of postal advice on stopping smoking.
D000328:Adult; D000329:Advertising; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D009524:Newspapers as Topic; D010174:Pamphlets; D011897:Random Allocation; D012606:Scotland; D000074606:Smoking Prevention; D011795:Surveys and Questionnaires