According to Wikipedia's definition , psychosis is an abnormal condition of the mind that results in difficulties determining what is real and what is not. Speaking as someone who has taken a very large dose of LSD, the boundary between alerted consciousness(or consciousness at all) and psychosis is very blurry. All of human experience is merely an interpretation of our stimuli, and one person's perception of reality is likely to be quite different from other people.

A key difference between LSD-indused psychosis and schizophrenia is timespan. For most people, the psychosis fades and they just become normal people again. (some people do trigger schizophrenia that persists after their trips, though it's rare)

[1] https://en.wikipedia.org/wiki/Psychosis?wprov=sfla1