We were actually given a story in assembly at school last year by our principal, about one of his family friends who was a really good and promising skier (racer i think) who developped schizophrenia after a lot of cannabis (real regular usage). Apparently his parents still try and take him skiing, hoping it'll help him and stuff, but he hates to leave the house cos he can't cope and his pants fall down and other embarrassing stuff. I think he has other problems due to the weed too, not just schizophrenia.
I wasn't paying much attention, we were laughing at the fact that our principal is bald, gay (honestly, out the closet gay) and wears glasses.