I think it's the sheer power of the hallucinogens that puts people off. You either love them or you hate them, and that's because they dissolve world views. And if you like the experience of having your entire ontological structure disappear out from under you, if you think that's a thrill, you'll probably love psychedelics.
Terence McKennaWe are alienated, so alienated that the self must disguise itself as an extraterrestrial in order not to alarm us with the truly bizarre dimensions that it encompasses.
Terence McKenna