Personally I've had visual snow for over a decade from a 5 minute Salvia trip. This means that instead of looking at the color white or black and seeing a clean color, I see a static cloud all over it. I'm one of the lucky ones - most of the people I've known over the years who messed with these substances ended up dead, with persistent mental illness, or brain fog that took years to clear up.
You roll the dice on your mental and physical well being every time you ingest a hallucinogen. The characterization of these substances as ones which induce visual hallucinations without mentioning the lifetime of mental health issues they leave people with is dangerous.