Effect of cigarette smoking on structure of the small airways.
D000328:Adult; D000368:Aged; D001980:Bronchi / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000473:pathology; D012129:Respiratory Function Tests; D012907:Smoking