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A prospective study of the attributable risk of cancer due to cigarette smoking.

P H Chyou, A M Nomura and G N Stemmermann

Japan-Hawaii Cancer Study, Kuakini Medical Center, Honolulu 96817.

BACKGROUND. The goals of this study were to measure the impact of cigarette smoking on cancer incidence and to determine the attributable risk of cancer due to smoking. METHODS. A cigarette smoking history was obtained from 8006 Japanese-American men examined from 1965 through 1968. After 22 years, 1389 incident cases of cancer were identified. There were 212 men with lung cancer; 202 with oral, esophageal, laryngeal, pancreatic, renal, ureteral, or bladder (oral-bladder) cancer; and 975 with cancer at other sites. RESULTS. Current smokers at time of examination had a higher incidence than nonsmokers for each of the three cancer site categories. Eighty-five percent of lung cancer cases diagnosed among current and never smokers can be attributed to cigarette smoking. The attributable risks were 46%, 16%, and 29%, respectively, for oral-bladder cancers, other cancers, and all cancers combined. In turn, the corresponding attributable risks were 60%, 26%, 13%, and 21% in comparing current smokers with past smokers. CONCLUSIONS. Current smokers can greatly reduce their risk of cancer, especially lung cancer, if they quit smoking.

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