21st-Century Hazards of Smoking and Benefits of Cessation in the United States.

This article examines the hazards of smoking in the 21st-century and the benefits of smoking cessation in the U.S. The study revealed that smokers lose at least one decade of life expectancy compared to non-smokers. It also showed that cessation before the age of 40 years reduces the risk of death associated with continued smoking by about 90 percent.