Well, that's not the point, now is it?
Here's the point:
Translation of that "gesture,": "Hey look at me, we're insiders about this - I'm an insider too, eh? - and we're being cool by singing about marijuana smoking - yeah, cool, eh?"
I guess. I have done that with friends who used to smoke it. I did it in a mocking manor. I just dont see a big deal and the rest of America wont either after the Clinton "presidency"...