Speaking as a sufferer of Schizotypal, I find that weed brings on psychosis. However, that can be a good thing as sometimes I need the breakdown to prevent the bigger one that's brewing. It resets the clock, so to speak. The psychosis brought about by smoking weed is much more temporary, and while intense, is nowhere near as damaging to me as the deep end of my sober delusional state. Left sober for two long I will find myself eating poorly, not sleeping, retreating from society and binging on cigarettes and caffeine. Smoking weeds is like taking a holiday. Shame it's often a day trip to hell.