6. Quit smoking
If you quit smoking by age 30, your survival rate can rival that of lifelong nonsmokers, according to a report in the British Medical Journal. Quit by 50 and you have half the risk continuing smokers have of dying in the next 15 years. Even if you’ve already developed a smoking-related health condition, you’ll benefit. “People who quit smoking after having a heart attack reduce their chances of having another by about 30 percent,” says Neville Suskin, MD, a cardiologist at the London Health Sciences Centre in Ontario.