Lung cancer is the second common cancer occurring in men and women. The fatal rate is higher in lung cancer than the combined numbers of breast, prostate and colon cancer. Smoking is the leading cause of this cancer. But there are people who suffer from lung cancer, though they are not smokers or not even passive smokers. When you quit smoking, the risk factor is reduced. When you quit at 30 years of age, the risk factor is reduced by 90%, and when you quit at 50, the risk factor is reduced by 50 percent. Find more about lung cancer from this easy quiz.