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Lung cancer, also known as carcinoma of the lung or pulmonary carcinoma, is a malignant lung tumor characterized by uncontrolled cell growth in tissues of the lung. Lung cancer are due to long-term exposure to tobacco smoke About 10–15% of cases occur in people, who have never smoked. These cases are often caused by a combination of genetic factors and exposure toradon gas, asbestos, or other forms of air pollution, including second-hand smoke.

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