I hesitate to even bother in this environment, where anything other than studies that meet the standards of rigor of Hacker News are dismissed, however: A lot

I hesitate to even bother in this environment, where anything other than studies that meet the standards of rigor of Hacker News are dismissed, however: A lot of people have a lot of idea about it, because a lot of psychiatrists and psychotherapists used LSD on their patients (and themselves) before it was outlawed.