Medicine: Making Cigarettes Safe?

Although the major cancer-causing substance in cigarette tar has not yet been identified, so much is now known about it that smoking could be rendered relatively harmless—without waiting for the substance to be isolated. This reassurance came last week from the man who, since his student days, has been busy amassing proof that heavy, long-continued cigarette smoking is the main cause of the recent dramatic increase in lung cancer: Dr. Ernest L. Wynder, 34, of Manhattan's Sloan-Kettering Institute.

Dr. Wynder told the American Association for Cancer Research, meeting in Chicago, that the villain is not present in tobacco leaves in...

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