In the intensive study of the relationship between cancer and cigarette smoking, it was clearly a breakthrough. Searching for the element in cigarette tar that causes cancers on mice (and, presumably, lung cancer in man), U.S. and Canadian scientists had narrowed the field to an identifiable fraction.
Last week Dr. Ernest L. Wynder of Manhattan's Sloan-Kettering Institute and the University of Toronto's Dr. George Wright told fellow experts in Atlantic City that they had separated the tar (by machine-smoking tons of cigarettes) into acid, alkaline and neutral portions. These were subdivided again until the researchers found the active cancer-causing fraction. It proved...
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