[Case-controlled study of the relationship between smoking and lung cancer in Tianjin].
D000367:Age Factors; D002681:China; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D013997:Time Factors; D014029:Tobacco Use Disorder / Q000150:complications*