If only one cigarrette in a billion made the smoker's head explode, they wouldn't buy it. But because it's a slow death, they put up with it. It's crazy. I hope this doesn't get confused with fat sympathy, but... you MUST eat food. So when you become addicted to food, you're still responsible and still to blame and still can change things, but you became an addict to something you must have to stay alive: there's no quitting it (not long term, though fasting is pretty awesome). Why on Earth do people even start smoking or doing illegal drugs? You don't begin, you don't have to stop doing them. Heck, even sugar addiction makes more sense: it's legal, you won't have supply problems, you will hardly go to jail trying to get your fix. It's still your fault, it's still wrong and you're still responsible, but among the nonsense, it makes more sense than any of the other addictions people get hooked to.