I've seen a few articles, reports and threads on the topic of hair loss as a result of amphetamine use. I believe it was R3flex (who used to be on here) who mentioned it once, and that was the first time I'd ever heard of the possibility.

I don't know much about the science behind it or the reasons why hair loss may be induced as a result of heavy stimulant use, just that if it's true, it would certainly make a lot of sense in my case.