title: Problems and results in the simultaneous assessment of the role of smoking and occupational dust exposure for chronic bronchitis and pulmonary emphysema.
mesh_terms: D000328:Adult; D000393:Air Pollutants / Q000009:adverse effects*; D000395:Air Pollutants, Occupational / Q000009:adverse effects*; D001991:Bronchitis / Q000175:diagnosis / Q000209:etiology*; D002908:Chronic Disease; D004391:Dust; D004812:Epidemiologic Methods; D006801:Humans; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000175:diagnosis / Q000209:etiology*; D012907:Smoking / Q000150:complications*
chemical_list: D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D004391:Dust