Researchers urge caution around psilocybin use. Researchers say that more than 10 percent believed their worst "bad trip" had put themselves or others in harm's way, and a substantial majority called their most distressing episode one of the top 10 biggest challenges of their lives.

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Researchers urge caution around psilocybin use. Researchers say that more than 10 percent believed their worst "bad trip" had put themselves or others in harm's way, and a substantial majority called their most distressing episode one of the top 10 biggest challenges of their lives.