title: Differences in airway obstruction between heavy smokers.
mesh_terms: D000402:Airway Obstruction / Q000097:blood / Q000503:physiopathology*; D005541:Forced Expiratory Volume; D006801:Humans; D007136:Immunoglobulins / Q000032:analysis; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000503:physiopathology; D012907:Smoking; D000515:alpha 1-Antitrypsin / Q000032:analysis
chemical_list: D007136:Immunoglobulins; D000515:alpha 1-Antitrypsin