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Lung cancer is a severe illness and it begins in the cells located in the lungs, this is most frequently the lining of the air passages (bronchi). It occurs when normal lung cells multiply excessively resulting in a tumor which usually spreads in the rest of the body in case of lack of early detection. The first cause is smoking, and non-smokers can be exposed to it because of pollution, second hand smoke, radon gas, or family history. Lung cancer is of two major types: Non-s