Does anyone know what conclusions (if any) could be drawn from the psychedelic studies of the 60's? The wikipedia page on the harvard study [0] is pretty light

Does anyone know what conclusions (if any) could be drawn from the psychedelic studies of the 60's? The wikipedia page on the harvard study [0] is pretty light on details. Though it looks like the study only lasted 2 or 3 years before being shut down. [0]: https://en.wikipedia.org/wiki/Harvard_Psilocybin_Project#:~:text=Each%20subject%20controlled%20its%20own,%C2%ABmarked%20broadening%20of%20awareness%C2%BB https://en.wikipedia.org/wiki/Harvard_Psilocybin_Project#:~:....