New research shows that the risk of developing lung cancer drops nearly 40% after heavy smokers have quit for this long. But you don’t have to wait that length of time to feel the benefits. After only one year of butting out, your risk of coronary heart disease is half that of a current smoker. And after just three months, your lung function actually increases. While tobacco use is still the leading cause of lung cancer, cigarettes aren’t the only source. You can be exposed to deadly carcinogens through e-cigarettes and even hookahs. What’s more, even though rates of lung cancer continue to decline overall, it’s more common in young women than young men in the U.S. If you’re struggling to quit, talk to your doctor and go to smokefree.gov for smart strategies.