Now, I don't think I'll ever dip back in again... but mostly, because I'm scared of it...and I've done way to much for my own good, as it is now.
You pretty much summed it up. My group of friends spent an amazing summer experimenting with some pretty good (clean) acid. We didn't know what we were getting into, basically just a bunch of redneck stoners and beer drinkers. We eventually figured it out as we learned to manage our trips by planning and controlling our location, company, music, and other drugs. We learned what all the hippies and Dead Heads already knew. Friends, love, and music are good. Hate, violence, and sirens are not. Eventually we all managed to experience a few bad trips mixed in with many good ones. As I grew older and tripped less frequently, the experiences were more likely to focus on personal reflection, self examination, soul searching etc. Very interesting and educational but not the carefree fun of before. I didn't really make a decision to quit it just sort of happened. I'm still friends with a few of those guys and it seems we all sort of stopped tripping around the same time for the same reasons. It just got a little too intense, scary and emotionally taxing. I figured "Self-limiting" summed it up pretty well as it seems to be a consistent timeline of use-quitting among most trippers.