I'm not sure I would go so far as to say I've given it up, but it has been a very long time, and I have almost zero iterest in reliving the past. It's a funny thing to have done which can make for some good stories, but I would never recommend it to somebody as a must do.
I don't know where to find it, but I have read some stuff written by the Swiss chemist who accidentally created LSD and then accidentally dosed out and rode his bike home. It is interesting reading.