Health service utilization by smokers and nonsmokers.
D000328:Adult; D000367:Age Factors; D002140:California; D005260:Female; D006123:Group Practice; D006296:Health Services / Q000706:statistics & numerical data*; D006760:Hospitalization; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D007348:Insurance, Health; D008297:Male; D008875:Middle Aged; D009098:Multiphasic Screening; D010808:Physical Examination; D010820:Physicians / Q000706:statistics & numerical data; D012494:Sampling Studies; D012737:Sex Factors; D012907:Smoking; D012923:Social Class; D013997:Time Factors