You can get it from one trip. Hell, you can even get it from smoking a joint. I know this sounds like something you might see in a DARE campaign but it is real. It's a very under appreciated risk of psychedelics. If you define HPPD as some level of negative visual changes that interfere with functioning I actually think a lot of people who have used psychedelics would quality to some extent. The question is: how significant are the changes? Are we talking almost imperceptible extra visual white noise or maybe like what I experienced that even made it harder to read and see at night. HPPD does seem to fade but it can take a long time.
There was a poll on the HPPD subreddit* which showed that more than half of people there got it from less than 5 uses of a psychedelic. But people there also seem to mix drugs, like cannabis with LSD.
* Admittedly, the people there have it the worst.
Oh a poll on a subreddit. Please forget my previous question - if you’re using pills on subreddits as a source there’s really no hope of having a serious conversation. You’re going on and on because of some personal bias.
My neighbour got it from the very first shroom use.