
Lung cancer is the most common form of the disease in the world and for 90 percent of all cases are caused by cigarette smoking. It kills 1.2 million people a year
About 10 to 15 percent of smokers develop lung cancer -- although they often die with other smoking-related causes like heart disease, stroke or emphysema. Lung cancer is also known to kill the people who never smoked or who gave up years ago
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