[MichaelGG]

https://en.wikipedia.org/wiki/LSD_and_schizophrenia

Look in the references: "Four additional studies found post-LSD psychotics with prior psychosis but also patients in whom the drug precipitated psychosis without a prodrome ... One group reported cases of psychosis following a single dose, suggesting a peculiar vulnerability to the drug in certain individuals. A review of this problem concluded that prior illness was evident in many, but not all, psychoses following LSD "

Your general gist seems to be correct (that it's a rather low risk for people without history), but "no one" seems to be incorrect. Which makes sense - LSD's a powerful medication. And for comparison, this happens with stuff they give to kids, like Ritalin and speed.

[Alex3917]

When I said since the beginning of modern psychedelic research, I meant since Rick Strassman began studying DMT in 1991. In the 50s and 60s there were lots of cases like this, but that's not really analogous to modern research. (In many cases back then they were actually purposely trying to cause mental illness.)

[trxcllnt]

That article's only reference is a study I linked to earlier, which concluded, "We did not find use of psychedelics to be an independent risk factor for mental health problems."