Regarding weed [1], regarding stress/sleep deprivation. I've heard that from a mental health professional. That's what he saw in the couple of patients he had to treat.
https://www.thelancet.com/journals/lanpsy/article/PIIS2215-0...
https://www.thelancet.com/journals/lanpsy/article/PIIS2215-0...
I also said that my other information was from people working in the field. If I say something like that, then I implicitly mean that I couldn't find it on the internet, which I find an interesting thing in itself.