Medicine: Smoking & Cancer (Contd.)

People who doubt that heavy cigarette smoking is a major cause of lung cancer have argued that there could be no real proof until comparison was made between groups of smokers and nonsmokers who are identical in all other major respects. Some have insisted that the villain in the lung-cancer picture is industrial air pollution. This week, under Los Angeles' smoggy pall, researchers reported on a study designed to refute both arguments.

Dr. Ernest L. Wynder of Manhattan's Sloan-Kettering Institute and Dr. Frank R. Lemon of the College of Medical Evangelists in Loma Linda...

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