50,000 residents of rural Norway were tracked as part of the study for 25 years. It was found that 41 percent of men who smoked heavily (at least one pack a day) died between 40 and 70 years of age as against 14 percent of men who did not smoke. Twenty-six percent of women who smoked heavily died between 40 and 70 years of age as against 9 percent of women, who did not smoke.
Dr. Stein Emil Volsett of the University of Bergen and colleagues said "Our study shows that smoking strongly reduces the chances of surviving from 40 to 70 years of age." It also revealed that if smoking is delayed, the chance of early death due to smoking is really dim. This study lends further support to smoking prevention campaigns, amongst teens and pre-teens.
It pays to quit smoking, also it is never too late to give up smoking, as studies have shown that sooner the smoker gives up, it enriches his health and certainly has a positive effect on longevity.