Giving up smoking.
D000293:Adolescent; D000328:Adult; D002638:Chewing Gum; D005260:Female; D006801:Humans; D008297:Male; D009538:Nicotine / Q000008:administration & dosage; D012907:Smoking; D014029:Tobacco Use Disorder / Q000523:psychology* / Q000628:therapy
D002638:Chewing Gum; D009538:Nicotine