Smoking patterns in Africans and Indians of Natal.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005006:Ethnicity; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology*; D013019:South Africa