Researchers urge caution around psilocybin use

In a survey of almost 2,000 people who said they had had a past negative experience when taking psilocybin-containing 'magic mushrooms,' a 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.