Several causes of lung cancer are possible, but one thing is clear: smoking is by far greatest risk factor. While other causes exist, they pale in comparison to the risk caused by cigarette smoke. Tobacco smoke accounts for about 80% of deaths in men and 75% in women. The more you smoke everyday increases your risk of obtaining lung cancer. Even if you stop smoking, it takes ten to almost fifteen years for your lungs to heal themselves, and for the risks of cancer to decrease to that of a nonsmoker. Cigarette smoke contains over 3,500 chemicals, most known as carcinogens. Some examples of these chemicals are

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