It may come as a surprise to many people to find out lung cancer is the leading cause of cancer deaths in the U.S. Cancer often develops in the lungs from breathing in toxic chemicals. The number one cause of lung cancer is smoking. If you are a smoker, it is not too late to decrease your chances of getting lung cancer by quitting. However, if you have already quit, you may still be at risk of developing this disease. For both smokers and former smokers, physicians recommend having a low-dose lung cance...