title: Unrecognized airway obstruction associated with smoking: a probable forerunner of obstructive pulmonary emphysema.
mesh_terms: D000402:Airway Obstruction; D006801:Humans; D011336:Probability; D011656:Pulmonary Emphysema / Q000209:etiology*; D012907:Smoking
keywords: PULMONARY EMPHYSEMA/etiology; SMOKING