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Lung cancer occurs when the cells within the lung tissue are altered at a genetic level to mutate and multiply at an aggressive rate. The results of many studies on the effects of tobacco have shown that cigarette smoke carries numerous chemicals, called âmutagensâ, that cause lung tissue cells to mutate. Substances such as carbon monoxide, hydrogen peroxide and benzopyrene contained in cigarette smoke affect how cells change and grow.
More than 8 out of 10 lung cancers are caused by smoking. Tobacco smoke contains carcinogens-substances that cause cancer. These substances damage lung cells, and over time the damaged cells can turn into lung cancer. The more you smoke and the longer you have smoked, the higher your chances of getting lung cancer.