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 a doctor in this free video on cancer. Expert: Dr. David Cathcart Bio: Dr. David Cathcart specializes in occupational medicine and has an in-depth knowledge of cancer, as well as experience dealing with cancer patients and treatment for multiple years. Filmmaker: Johnny Cathcart

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