Mj is a trip for me. I cannot stop thinking. I become uber focused on figuring things out. It's cool if I'm just chilling, but it's crippling if I'm trying to do something. I can't focus on anything outside of my head for a length of time.
psychedelics are pretty crazy, but I've only tried salvia which from what I hear is actually one of the strongest hallucinogens. After about 15 minutes of being in another dimension, I was wondering what the actual reality was for a bit.
edit: thought i'd mention I don't do any drugs anymore.. aside from an occasional mj session.