Some of my mates were into all this back in the early 90’s, rave days etc when LSD was popular. They were deeply into it and were in touch with Timothy Leary and stuff, brought ketamine back from India (in water bottles) before most people even knew what it was.
I vaguely recall doing ayahuasca at Glastonbury once but my memory of that few days is sketchy to say the least. Also, a few I know who had issues with brown got into DMT to try and free themselves of addiction. Heavy shit