Another hallucinogen widely used among college students are psilocybin mushrooms. "Shrooms" have a naturally occurring hallucinogenic property to them. They are generally not considered as powerful as LSD or PCP. The duration of the high and the intensity of the high tends to be less intense with Psilocybin mushrooms. They are generally purchased in dried form. Often they are kept in student's freezers in frozen form. They have a very disgusting taste. Oftentimes people who are using psilocybin mushrooms will feel nauseous after they first ingest them. One issue is that there is a very significant percentage of psilocybin mushrooms available on the market which actually are not psilocybin mushrooms but are simply mushrooms which are treated with LSD. Therefore students have no idea what they are actually taking.