No matter what your age or how long you have smoked, giving up cigarettes improves your chances of living a longer life. Just 12 hours after your last cigarette, the carbon monoxide level in your blood returns to normal. A year after you've quit, your risk of heart disease is half that of a smoker's. This quiz can help you learn about the benefits of quitting smoking.
The things that lead to nicotine dependence are similar to those that cause other addictions. Risk factors may include: