Use them with care, and use them with respect as to the transformations they can achieve, and you have an extraordinary research tool. Go banging about with a psychedelic drug for a Saturday night turn-on, and you can get into a really bad place, psychologically. Know what you're using, decide just why you're using it, and you can have a rich experience. They're not addictive, and they're certainly not escapist, either, but they're exceptionally valuable tools for understanding the human mind, and how it works.
I don't know if you realize this, but there are some researchers - doctors - who are giving this kind of drug to volunteers, to see what the effects are, and they're doing it the proper scientific way, in clean white hospital rooms, away from trees and flowers and the wind, and they're surprised at how many of the experiments turn sour. They've never taken any sort of psychedelic themselves, needless to say. Their volunteers - they're called 'subjects,' of course - are given mescaline or LSD and they're all opened up to their surroundings, very sensitive to color and light and other people's emotions, and what are they given to react to? Metal bed-frames and plaster walls, and an occasional white coat carrying a clipboard. Sterility. Most of them say afterward that they'll never do it again.