I don't know, but they sure had an affect on me. I started so young, though, that it's hard to tell what I would have been without taking them, so I feel I don't have much of a right to decide that question.
In my case, none, but Hendrix's Electric Ladyland never sounded better.
For sure!
None. People mistake the effects of mind altering drugs for something supernatural.
It isn't. That's why I started with none.