Quitting smoking reduces the risk of cancer and other diseases, such as heart disease and lung disease, caused by smoking.
People who quit smoking, regardless of their age, are less likely than those who continue to smoke to die from smoking-related illness.
Studies have shown that quitting at about age 30 reduces the chance of dying from smoking-related diseases by more than 90 percent.
People who quit at about age 50 reduce their risk of dying prematurely by 50 percent compared with those who continue to smoke.
Even people who quit at about age 60 or older live longer than those who continue to smoke.