Smoking and Your Heart :

If you smoke, your risk of heart disease is 2 to 4 times greater than a nonsmoker's. And if you smoke around loved ones, you're increasing their risk with secondhand smoke. Each year in the U.S., more than 135,000 people die from smoking-related heart disease. But it's never too late to quit. Within 24 hours of quitting, your heart attack risk begins to fall