Smoking and the use of the health service.
D000367:Age Factors; D000368:Aged; D005194:Family Practice; D005260:Female; D006760:Hospitalization; D006801:Humans; D008297:Male; D008875:Middle Aged; D010044:Outpatient Clinics, Hospital; D012907:Smoking; D013222:State Medicine; D006113:United Kingdom