Only one of the studies Wikipedia included had concerning results, and it was a survey of users. Such studies are good indicators of where future research shoul

Only one of the studies Wikipedia included had concerning results, and it was a survey of users. Such studies are good indicators of where future research should be done, but only demonstrate a loose correlation between psychedelics and HPPD. There’s no differentiating users who are “self-medicating” the issue from psychedelics causing the issue.