Smoking cessation: a critical investigative tool in COPD.
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D005500:Follow-Up Studies; D006801:Humans; D010349:Patient Compliance; D029424:Pulmonary Disease, Chronic Obstructive / Q000209:etiology / Q000628:therapy*; D012907:Smoking / Q000009:adverse effects; D016540:Smoking Cessation; D016896:Treatment Outcome