Except doesn't heroin give you intense rushes of euphoria? It's still stupid to start, but I kind of understand why someone would want to experience that. And then there's the physical dependence you can develop to heroin to the point of dying if you stop taking it.
From what I've read in books, smoking gives you a lightheaded, dizzy feeling. I don't get why someone would start. Unless I'm missing something, since I've never actually smoked, and every time I pass by someone on the street who's smoking, the smell alone makes me feel ill and breathing in any of the secondhand stuff makes me cough like crazy.
My point is that people do stupid things for things that feel good: drug use, unprotected sex, daredevil stunts, etc. I even understand why someone would develop a dependence on alcohol, since it makes you feel all giddy. But why smoking? Is there some pleasure in smoking that I am not aware of?