The main types of lung cancer are small-cell lung cancer (SCLC), also called oat cell cancer, and non-small-cell lung cancer (NSCLC). The most common cause of lung cancer is long-term exposure to tobacco smoke.Nonsmokers account for 15% of lung cancer cases, and these cases are often attributed to a combination of genetic factors,radon gas, asbestos and air pollution including secondhand smoke.
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