I think one thing we might want to be aware of in such a discussion is the pretense that psycedelics could "make" someone psychotic. We must remember that this is a line of propoganda that has been sucessfully pushed upon many by our fearmongering government ( using our money to do so.)
Now that being said, I suppose ANYTHING can make ANYONE shift. Candy is said to make children hyperactive and may lead to attention deficit, etc...blah, blah....
Could spice be a trigger? Maybe, but maybe so could caffene (sp?) from coffee. What makes sense I think is simply for anyone with any history of a troubled emotional life to stay away from anything strong. Only use psycedelics if you feel stable enough, and even then learn it slowly to be sure it works for you in a positive way.
Peace
Mad Banshee
Note that the poster of this message would never actually use or recommend to use illegal substances. He is just an attention seeker and should be considered to be lying about everything he posts and his posts are only for the sake of generating discussion.