Except of course we can't know for sure the anecdote was an example of LSD causing visual snow, the drug might have been spiked or it could've just been a coinc

Except of course we can't know for sure the anecdote was an example of LSD causing visual snow, the drug might have been spiked or it could've just been a coincidence... Anecdotes are at best a clue that there's more research needed. Unfortunately for many people they're also often far more memorable and even convincing than cold hard statistics.