For anyone who is curious (or skeptical) about the incredible potential for psychedelic use in a therapeutic setting, I highly recommend this read: http://www.salon.com/2011/09/28/the_new_lsd_cure/ Probably the best general article I've read on the subject in recent times; it's also very hopeful.
of course rumor has it he would take DMT via IV for 8 + hours several times a week. I can only imagine what that would do to someone's mind (hint it wouldn't be pretty)