It turns out smoking causes more illness and death than previously thought. In a study funded by the American Cancer Society, researchers found that there are five new diseases and an additional 60,000 deaths per year contributed to smoking.
These are: kidney disease, intestinal disease, infections, and heart and lung problems not previously attributed to tobacco. Smokers are twice as likely to die from these five illnesses than nonsmokers. One effect of smoking is that it weakens the immune system, making smokers at risk of infections.