Cigarette smoking is known to be the cause of most lung cancers. The risk of the disease increases with the number of cigarettes smoked. Filtered and low tar cigarettes may reduce the risk slightly, but it is still far greater than that of a non-smoker. If a person stops smoking, the risk of lung cancer goes down quite quickly, and after about fifteen years their chances of developing the disease are similar to that of …showed first 75 words of 666 total…

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