Identifying a better message strategy for dissuading smokers: Add the positive

(Georgetown University Medical Center) Which is more likely to convince a smoker to quit? The words, 'Warning: cigarettes cause cancer' beneath the image of an open mouth with a cancerous lesion and rotten teeth, or the same image with the words, 'Warning: Quitting smoking reduces the risk of cancer'? The answer depends on how confident you are in your ability to quit.