Age and addiction to smoking.
D000328:Adult; D000367:Age Factors; D006801:Humans; D008297:Male; D008875:Middle Aged; D009042:Motivation; D009538:Nicotine / Q000494:pharmacology; D012907:Smoking; D011795:Surveys and Questionnaires; D013638:Tars / Q000494:pharmacology
D013638:Tars; D009538:Nicotine