A new study found that people who smoke cut their life span short by at least ten years.
While it’s no surprise smoking has bad health effects, researchers say this latest inquiry is unlike anything done in the past.
About 1.3 billion people smoke worldwide, and 35 million are in the U.S.
Scientists say smokers here are three times more likely to die between ages 25 and 79 than non-smokers, and about 60% of those deaths are directly related to smoking.