title: Influence of smoking and cessation of smoking on lung function: a population study of closing volume and nitrogen wash-out.
mesh_terms: D006801:Humans; D008168:Lung / Q000503:physiopathology*; D008176:Lung Volume Measurements / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009590:Nitrogen Radioisotopes; D012907:Smoking / Q000503:physiopathology*; D013147:Spirometry; D014692:Ventilation-Perfusion Ratio
chemical_list: D009590:Nitrogen Radioisotopes