Seriously, if you're a celeb over there and caught smoking a joint, your career is basically over.
Even the infamously prudish U.S. is more accepting of it.
I'm guessing it's a leftover of U.S, imperialism, like how all their porn is still censored.
Depending on the historical doccument you like some Mongolian groups loved thr weed.
Famously the scythians used to smoke bathe in it. Just hot box an entire yurt. Which is based as hell.