Mistake. Smoking doesn't cause heart attacks. In randmized intervention trials, where researchers pick a random subset of smokers and convince them to quit, then follow them for years or decades, comparing them to control group (smokers left alone), the quit group gets more heart attacks and more lung cancers. That's why only a handful such trials were done (in early years of antismoking swindle) and you don't hear much about them. Similarly, in animal experiments, the smoking animals live longer and have better health. The antismoking racket has stopped doing the real science on smoking since the results too often come out the "wrong way" showing that the correlations between smoking and disease are of the same kind as those between taking aspirin and headaches.
In short, smoking is good for you.
“The results of all were uniform, forthright and unequivocal: giving up smoking, even when fortified by improved diet and exercise, produced no increase in life expectancy. Nor was there any change in the death rate for heart disease or for cancer.”
Increased life expectancy is not my goal. Improved quality of life is. I don't want to live to be 100. I just want to live my final years without spewing tar with every cough. I want to be able to run up a flight of stairs, or “dance” for more than 10 minutes, and not be short-winded. I want to leave the house and not worry about remembering to bring smokes and matches. I want to taste a Big Mac and fries, the way they tasted when I was a kid. That's just a few of the good things that happen when you quit smoking.
Also, the earth is flat.