Letter: Nitrogen oxides, tobacco smoke, and chronic disease.
D006801:Humans; D008173:Lung Diseases, Obstructive / Q000209:etiology; D009585:Nitrogen Dioxide / Q000633:toxicity; D009589:Nitrogen Oxides / Q000633:toxicity; D012907:Smoking / Q000150:complications*
D009589:Nitrogen Oxides; D009585:Nitrogen Dioxide