Medicine: Smoking and Cancer--in Dogs

Cigarette tar painted on the backs of mice has long been known to produce cancer, but until now there has been no proof that lung cancer of the human type could be induced in any animal by forcing it to smoke. Thus, said the tobacco industry, there was no evidence that cigarette smoking caused lung cancer. The fact that heavy smokers are 20 times as likely to die of lung cancer as nonsmokers, said its spokesmen, was merely a "statistical association" that did not prove a cause-and-effect relationship.

Last week, in the hope of...

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