It's worth noting, for example, that a 2016 survey fielded bIt's worth noting, for example, that a 2016 survey fielded by Johns Hopkins researchers and published in the Journal of Psychopharmacology found that of the people who had bad experiences after taking psilocybin mushrooms, 10% felt their "bad trip" put themselves or others in danger. Yet many who experienced the negative side effects of 'shrooms which can include hallucinations, dizziness, drowsiness, vomiting and paranoia still said the experience was "meaningful" and "worthwhile."