Smoking and Heart Disease - WebMD http://www.webmd.com... direct correlation to smoking Quitting tobacco has immediate benefits. good 20% http://www.webmd.com/smoking-cessation/quit-smoking-heart http://www.webmd.com/smoking-cessation/quit-smoking-heart http://www.webmd.com/smoking-cessation/quit-smoking-heart http://www.webmd.com/smoking-cessation/quit-smoking-heart heart disease caused by smoking Smoking and Heart Disease Smoking causes heart disease heart disease http://www.webmd.com/smoking-cessation/quit-smoking-heart http://www.webmd.com/smoking-cessation/quit-smoking-heart Smoking causes about 20% of heart disease deaths http://www.webmd.com/smoking-cessation/quit-smoking-heart Smoking and Heart Disease http://www.webmd.com/smoking-cessation/quit-smoking-heart 20 percent