The relationships of quantified human smoking behavior and demographic variables.
D000328:Adult; D000367:Age Factors; D000368:Aged; D004522:Educational Status; D005006:Ethnicity; D005260:Female; D006801:Humans; D007182:Income; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology*