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by o0o0_ooo 3779 days ago
HPPD is definitely real, but I would describe that as a more or less constant experience of after-effects for weeks/months/etc.

I took enough LSD and other substances to experience HPPD that steadily faded over the course of about 3 months. Once it was over though, I never randomly experienced a small trip or anything.

From what I've read that idea comes from a myth that psychedelics build up in parts of the body (e.g. the spine) and can spontaneously be released. So, I wouldn't worry about it (and for what it's worth -- I'll get downvoted to hell for this -- but in the past I drove hundreds of times on psychedelics, without incident)