Crystal meth, along with cocaine, is what I call an "idiot's" drug: we all know the dangers and the risks in doing it, but people still do it anyway.
I've seen people who were both tweaked and coming-down from jib. Not a fucking pretty sight - the more they bump, the more they want.
Of course, when you're completely sloshed out of your skull after 3-5 drinks at the local tavern, you wouldn't know a jibbernaut from a roller, a basehead or a bunner. Maybe that's why I don't go out that often these days.