Lung cancer harms the body when free radicals in the atmosphere cause changes in sensitive lung tissue. Quit smoking to reduce the chances of lung cancer with advice 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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