Link Between Lung Cancer and Smoking

For years the tobacco companies said that smoking did not cause lung cancer. We now know that smokers are at a much higher risk of developing lung cancer and about 10% of all smokers will develop the disease. About 90% of all lung cancers are in smokers. This article tells of several genetic studies that are showing certain genetic traits that may make a person more likely to become addicted to smoking and also more likely to develop lung cancer. So reality might be that lung cancer is a relationship between heredity and environment. Lung cancer has been so fatal because it is usually found late after it has already spread but a new type of CAT scan, a spiral CAT Scan can find tumors that are small enough to be treatable. This test is not covered by insurance because it hasn't been proved that the survival rate of finding a lung cancer tumor when it is smaller increases life expectancy but it only makes sense to find it as early as you can.

http://www.medscape.com/viewarticle/576699?src=mp&spon=17&uac=103794FK