Sugar, that is...
I enjoy a good hit of sugar. Cookies, chocolate, whatever. (I do drink my coffee black, though.) But the problem comes when the sugar wears off. The craving for another "fix" is not quite as strong as cocaine (which I have never experienced - but have read about).
We know that when we eat a candy bar:
1. It's not good for our waistline (for some people)
2. The high will wear off
3. It costs something that would probably be better spent elsewhere
So why do we do it?
Well, the cost must be more than the expenses - at least in the short-term. I think all of us live our lives with a mixture of short-term orientation and long-term orientation.