Heroin halts the natural production of Endorphins(sp) in your body. It's not easy... it's rather harsh. If you abuse it.

Meth's dangerous toxic ingredients are broken down and only certain parts of these toxins are used. And also if you don't use often then you won't get brain damage... for christ sakes... only the few of you have been blathering on while the rest of us have been telling you that we've used and we're fine. You guys are so brainwashed.