Yes, in fact visual snow has quite an overlap in symptoms with HPPD experienced by some chronic users of psychedelics! It was even sometimes misdiagnosed as HPPD in the past, although that theory was discounted as the vast majority of visual snow patients don't have a history of psychedelic use (I was far too much of a nerd to be dropping acid aged 14/15 when I contracted the disorder!). For me the appearance of these visuals is triggered by closely repeating patterns such as bricks, tiles, striped or chequered shirts, chessboards, that sort of thing. It makes reading a bit difficult sometimes too, I really struggle with dense typography like newsprint for example so I usually read on a Kindle with the line spacing and font size set quite high.

I definitely think psychedelics have a role to play in understanding these dysfunctions of the visual system, although unfortunately my country (the UK) has a very unenlightened view when it comes to banning things and firing chief scientific advisors when they point out that there's no real scientific justification for prohibitionism. Vernon Dursley is apparently the target voter for both major parties!