[danielharan]

I heard of people going psychotic; just as pot can trigger anxiety, it seems to hallucinogens may trigger bigger breakdowns.

Unfortunately, we can't really measure the incidence or tell what these effects are because the drugs are illegal - so we don't know how many people used them or what exactly they consumed.

Maybe a lower risk path is starting with yoga and meditation (and stop immediately if it appears you are experiencing a psychotic episode; avoid teachers that think this isn't possible).