title: Detection of peripheral airways obstruction in smokers using air vs. helium spirometry.
mesh_terms: D000375:Aging; D000388:Air; D000402:Airway Obstruction / Q000175:diagnosis*; D005260:Female; D005540:Forced Expiratory Flow Rates; D006371:Helium; D006801:Humans; D008297:Male; D012907:Smoking / Q000503:physiopathology*; D013147:Spirometry / Q000379:methods*
chemical_list: D006371:Helium