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Smoking is the number one cause of lung cancer. Lung cancer may also be the most tragic cancer because in most cases, it might have been prevented -- 87% of lung cancer cases are caused by smoking. Cigarette smoke contains more than 4,000 different chemicals, many of which are proven cancer-causing substances, or carcinogens. Smoking cigars or pipes also increases the risk of lung cancer. The more time and quantity you smoke, the greater your risk of lung cancer. But if you stop smoking, the risk of lung cancer decreases each year as normal cells replace abnormal cells. After ten years, the risk drops to a level that is one-third to one-half of the risk for people who continue to smoke. In addition, quitting smoking greatly reduces the risk of developing other smoking-related diseases, such as heart disease, stroke, emphysema and chronic bronchitis. Many of the chemicals in tobacco smoke also affect the non-smoker inhaling the smoke, making "second-hand smoking" another important cause of lung cancer. It is responsible for approximately 3,000 lung cancer deaths and as many as 50,000 deaths from heart disease annually.
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