LadyM, I have that DVD Reefer Madness, that I picked up cheap for measly five [Australian] dollars a while back.
From memory, the characters all acted like they were violently *drunk*, not stoned, from the start to the end. They moved too quickly, and were distinctly discoordinated as well.
They certainly didn't sing or indulge in bursts of creavity, like doodling for hours improbable pics of, for example, very pregnant mermaids, in sketchpads. Or crack fearsomely bad puns or wordplays. And I don't think they had any attacks of the famed *munchies*.

In short, the Reefer Madness was a government's ignorant idea of a joke, IMHO.
Good as an educational insight and for a laugh at the 1950's bureaucrats and politicans trying to pull a fast one over the public without doing any homework, but not much else.