Smoked opium many times in Vietnam in 1968-1969. Also shot a mixture of speed and liquid opium twice. (opium was legal there) Not sure about the speed.
Did MDA a couple of times in America in the early 70's. Don't remember exactly when. I do remember thinking it wasn't very good as I was doing a lot of acid then. I didn't obtain it legally, (got it from a dealer) but I think it wasn't illegal yet.
A friend and I went through a 100 tablet bottle of dexidrine in a week. It was perscription then. I don't know how he got them but I remember we slept for 3 days after we ran out of them and crashed.