Tobacco smoking in Ceylon.
D001114:Areca; D001984:Bronchial Neoplasms / Q000453:epidemiology; D004522:Educational Status; D005260:Female; D006184:Habits; D006801:Humans; D008297:Male; D010946:Plants, Medicinal; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology*; D013188:Sri Lanka