But four years later, voters in a growing list of its cities ... amounts of plant-based hallucinogens. Psilocybin, found in several species of mushrooms, can cause hours of vivid hallucinations.

A Growing Number of Oregon Cities Vote to Ban Psychedelic Mushroom Compound Psilocybin PORTLAND, Ore. (AP) — Drug reform advocates hailed Oregon as a progressive leader when it became the first ...