Researchers who contend that heavy cigarette smoking is the major cause
of lung cancer tend to minimize the possible importance of air
pollution as another cause. On the other hand, the air-pollution
enthusiasts minimize the importance of smoking. Last week Dr. Wilhelm
C. Hueper of the National Cancer Institute told public-health engineers
meeting in Atlantic City that the pattern of the increase in lung
cancer coincides not with the pattern of increased smoking, but more
closely with the use of cancer-causing substances in industry and their
appearance in engine-exhaust fumes. Conceding that much of his evidence
was circumstantial, Dr. Hueper concluded...
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