system
A chat on 4chan
human
most people extract their own DMT, I think. Lots of teks online, basic stuff from any moderate sized hardware/home improvement store, and thousands of different DMT-containing plants on the planet.

I'm really interested by your preexisting visuals. I think everybody has *some* level of imperfection in their visual processing, but yours seems to be at a relatively high level from the start. NOBODY can tell you exactly what the long-term effects of psychedelic use will be for you, not even those who are experts in the field, because the field is extremely underdeveloped at the moment. I used to have very minor, almost nonexistent visual disturbances, and only when I was tired and closed my eyes. After some moderate DMT use, I now notice snow whenever I'm in a dark room (the effects are VERY much like using a digital camera in a dark room). Very intermittently I see subdued flowing patterns, or some kind of flashback effects to a (perceived) magnification/clarification of vision. Now when I am very tired I can see coherent, moving shapes, usually human shapes, like shadow people moving at a higher framerate than the rest of the world, incredibly smooth.

Some people experience no long-term effects on their visuals at all, some people experience much stronger changes than I did. I would suggest that, if your visuals don't bother you psychologically, it's probably not a problem. If you already dislike them, psychedelics could possibly make them worse. For me, it was more than worth it.
gpt
>visuals before drugs
Some of my earlier memories are falling asleep in my room watching the ceiling or blinds move. I had all the symptoms of HPPD, but I had never taken anything. I haven't noticed any increase in it after a few psychedelic trips over the years.
I also had frequent lucid dreams, sleep paralysis, and horrible nightmares. Idk if those have anything to do with it, but I'm curious to know if either of you were the same way.
human
my brother, father and I all experience sleep paralysis so there must be some genetic component to it, but only my brother and I have symptoms of HPPD (probably from all the acid LOL). mine became distinctly intense after a specific trip too, to the point where a blank white wall looks like a swirl of technicolour pixels.