When I was sent away to boarding school in the early 1990's there was no pot (and I hadn't really been exposed to pot at that point anyway). No cigarettes. Nothing. We rolled something in paper, laced it with powder we scratched off the inside of a Polaroid picture, and tried to smoke it. I can't even remember what it was. I didn't really inhale, thus nothing happened.
I once mistook rat poison for hash. I think that's just around the time the psychological problems started.