Psychedelic mushrooms can closely resemble mushrooms used in cooking, and are grown in a similar way. Unlike mushrooms for cooking, however, these nearly 200 species of mushrooms contain psilocybin, a mind-altering chemical. Teens may trip on psilocybin mushrooms much like they would on LSD — eating them can lead to an altered sense of space and time, hallucinations and euphoria — along with nausea and panic attacks.