Interesting that so many people in study have taken psychedelics. I wonder how that compares to general population?

“ Mean (SD) participant age was 40.4 (10.9) years in the psilocybin group and 41.8 (11.7) years in the niacin group; half were men and the majority (89%) were White. Ten participants (19.6%) in the psilocybin group and 13 (24.5%) in the niacin group reported previous lifetime use of a psychedelic”