Hey all, I decided since my HPPD is mild I would, for science, take these drugs and give a report.
Cannabis- nothing noticeably bad during the high, however very much increased visual static for about 11 or 15 hours afterwards. Specifaclly in the dark as well. Opinion: isn't gonna do anything permanent with extremely moderated use but not recommended. Will probably have long lasting negative effects of not moderate.
Vyvanse - no real increase in visual sympotms. However, I have mild HPPD and could be worse with people who have it worse than me. Should be fine to take though. If it bothers you, don't take it again. If not, moderate it.