Quitting smoking before the age of 40 can lead to a life expectancy similar to that of non-smokers, says a study. The University of Toronto study followed 1.5 million adults from the US, UK, Canada and Norway for 15 years.
Ex-smoker had a 30 percent lower risk of death compared to non-Smokers. There are about 60 million smokers in the four countries involved in the study, and more than a billion smokers worldwide. Although the global smoking rate has decreased by more than 25 percent since 1990, tobacco remains a leading cause of preventable death.