"I'm going to go out on a limb here and say we knew diddley-squat about marijuana in 1930 compared to what we know today."
Of course I've yet to see you cite a single credible study which suggests anything different.
Like my cites would convince you.
(Then again, you did accept that 1930 study and the Ethiopian Zion Coptic Church study as valid, so maybe you're dumb enough to accept anything I post.)