I'm sure there are correlations between some life risks and being a hippie vs not being a hippie. Stereotypes say hippies are more care-free, so that may make them more prone to risk taking, and more likely to die of (fun example) ziplining accidents.

If something has detrimental effects (dyeing on ziplines) that are outweighed by positive effects (lower blood pressure), it is not fair to say it has no detrimental effects whatsoever.

However I would say the biggest issue with the title is that it doesn't mention the number receiving psilocybin. 60 people is not a lot to say it has no detrimental effects, even if it weren't turning people into hippies.