In fact, the number of cigarettes smoked plays a minimal role. Important fact: a person has this addiction or not. The most pronounced connection is between Smoking and lung cancer. However, other cancers often develop on the background of nicotine addiction.
Experts from the National cancer Institute claim that just one cigarette smoked during the day by 69% increases the risk of premature death. Smoking half a pack per day increases the probability to 87%.
Pleases only the fact that a timely rejection of cigarettes for several years allows to reduce the risks to a minimum. Note that in such cases recovery is not immediate, it takes a few years.