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Lung cancer develops when smoking, air pollutants and free radical formation damages sensitive lung tissue, causing the cellular DNA to restructure and malfunction. Avoid lung cancer by quitting smoking with information from adoctor in this free video on cancer. Expert: Dr. David Cathcart Bio: Dr. David Cathcart has been an occupational medicine physician at Heartland Regional Medical Center in St. Joseph, Mo. for more than 20 years. Filmmaker: Johnny Cathcart

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Filed under: Lung Cancer

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