@Didymos Thomas,
I also had this experience, though only once-but I did it without any drugs. and I do believe it is the same thing. the difference lies in the mental stability of the person who has them, not the way they got there. I also think that is why some people realize that the experience is only the key to the treasurehouse-once you are there, you dont need the key any more. the ones who keep going and ultimately self-destruct got a glimpse of the truth before they were able to assimilate it. that is why all the spiritual traditions have warnings not to go too fast too soon.
I also would say that the high state of ecstasy isnt meant to be maintained-if it did, no one would be able to function in the world at the same time-well, maybe there were rare cases of people who did, but barely. they wouldnt have thought to eat or wear clothes or look both ways, etc...so I think the point of enlightenment would be to know what is the actual reality, and that this world is not all there is. it leaves one freer to enjoy it and somehow wanting to choose to make it meaningful yet not mandatory...hard to explain.
because think about it-if the state of bliss was so great, why would anyone come back from it? surely some people never did, the ones we never hear about. but what about people who must surely have reached it, such as buddha, they must have seen something of value in this state of 'existence' as opposed to the non-existence of bliss. so as krumple said, yes it is poisonous-but only if you dont realize it is only a manifestation of something ... something else.
the other thing I remember about that little trip, is that for me, at the time 26 years old and having spent most of my life wishing I was dead (not because of any circumstances, just an aching, crippling hopelessness and despair) I knew then that I would go back to the beginning and live my whole life all over again and endure the same suffering just for the sake of having that experience. somehow nothing ever looked that bad to me again afterwards.
so that is why I would also not discourage anyone from trying anything to reach it. I know the traditional paths are the safest, but they take long and are hard work...some people need that instant gratification and a little money upfront before they are willing to put any into the game.