I don't think that's it, either. I think it's that the word "ganja", in United States parlance, is sort of puerile and gets uttered ironically more than it does

I don't think that's it, either. I think it's that the word "ganja", in United States parlance, is sort of puerile and gets uttered ironically more than it does unironically. I think that most of us not caring about weed anymore is what makes the oblique reference to it kind of passe and eye-rolly.