I'm one of the few people who simply doesn't "get" meth. Not for lack of effort - I've tried it on maybe 10 occasions, and with no real restraint... let's say the quantities were generous.
But all it ever did was make me edgy and irritable.
But I routinely warn others that there are three drug types to watch out for: opiates, coke, and meth. I've seen meth wreck the lives of others.