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Study Shows Smoking Responsible for 11 Types of Cancer
A 50-year study concludes that smoking causes at least 11 types of cancer in men, with lung cancer the top killer.
Researchers looked at mortality data on 30,000 male British doctors, focusing on the 34,439 who first identified themselves as smokers in 1951. "In all, 11 of the 13 types in men ... classed as liable to be caused by smoking were significantly related to smoking and the findings for the other two, which caused only few deaths, suggested they might be," wrote authors Richard Doll, Richard Peto, and colleagues from the Radcliffe Infirmary in Oxford, England.
The researchers found that heavy smokers were 25 times more likely to die of lung cancer than their nonsmoking peers. Risk of dying of lung cancer increased with the number of cigarettes smoked, with heavy smokers three times more likely to get lung cancer than light smokers (those who smoked fewer than 15 cigarettes per day).
Other cancers linked to smoking included malignancies of the esophagus, bladder, larynx, pancreas, and rectal, nasal, and nasopharyngeal cancers. However, colon and prostate cancer appeared to be unrelated to smoking.
The study was published in the Jan. 25, 2005 issue of the British Journal of Cancer.
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