Smoking reduces a person's life expectancy from anything from 7 years to 30 years. Generally smokers are less healthy and less physically fit than non-smokers. In addition, they take more days off work through illness than non-smokers and are more prone to common illnesses such as colds or sore throats. Smokers will get out of breath much quicker after exertion and find it harder to exercise and they will also have a higher risk of infections, as the body's immune system is damaged from smoking.