Trainspotting was realistic enough.. except when he thought he dove through the toilet and was in the ocean, that made no sense, that's like acid or dust. junkies can pull off alot of elaborate shit.. if they aren't sick. they're like evil crime-robots.
i hated Requim for a Dream with a passion. films with fictitious drugs, that are a compostion of several.. are pretty hack to me. i can't stand it either when they get artsy and try to glamourise junkies with a counter-glamorous message. which is why i generally hate drug culture movies. people always trick me into watching them though. Spun and Fear & Loathing.. are the only ones i've ever liked.
I agree with you on Spun and Fear and loathing, those films were grade A choice.