Really? I think the opposite is true.
Given 1/6 adults admit to using it, I think it's totally underrepresented in media -- in theory 1/6 characters would be using it.
It's only very recently that I see characters who just casually say something like "I take a gummy for a long flight" or whatever, rather than be a stereotypical comedic stoner character.
I feel like really it's alcohol that's glamorized in the media, and before that it was smoking.