A study on British smokers (Doll 2004) shows that the earlier someone stops smoking, the more years of life is preserved. It is important to note that ceasing smoking at 40 years old is estimated to extend life by 9 years. 9 years that could be used to travel the world after retiring or see how a grandchild grows up. This increase in lifespan is information that can be used as motivation to quit, and should be shared with people intending to give up smoking.