Like Seren said there are actually tours people can go to to experience this. I just recently read (can't remember where, Mother Jones maybe? ) about some people who went to Peru to do such a tour. The person overseeing the ceremony was actually a Frenchman living there. According to the article there are a lot of people offering this now- some legit and some just cashing in. So to answer your topic's question, it can probably be both, depending on the intention of the ones giving it, and those who are receiving. Vomiting, terror, and shitting oneself were also present.... not my kind of spiritual journey! But all who did claim to come out of it changed and purified. Still though... I'd rather get a massage and some reiki, and enjoy a cup of white tea, of course after hiking around in scenic nature. That would be my ideal spiritual experience.