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Smoking or living with a smoker

Sure, you've heard it a million times before: Don't smoke. But it bears repeating.

"Smoking is a total disaster for your heart," says Dr. Ostfeld. Smoking promotes blood clots, which can block blood flow to the heart, and contributes to plaque buildup in the arteries.

It's also a smart bomb aimed at everyone around you, Dr. Ostfeld says. In fact, about 46,000 nonsmokers who live with a smoker die from heart disease each year because of secondhand smoke.

Next: Stopping or skipping meds