Emphysema.
D015984:Causality; D004646:Emphysema / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D006801:Humans; D010102:Oxygen Inhalation Therapy; D011013:Pneumonectomy; D011175:Positive-Pressure Respiration; D012907:Smoking / Q000009:adverse effects; D000074606:Smoking Prevention; D013147:Spirometry