This is a longshot, but…
I used to occasionally buy a magazine (in the mid-to-late '90s, I think) that collected various newspaper comics and editorial cartoons (e.g. Ted Rall, This Modern World, and others I can’t remember).
In one of those issues, I saw a particular comic that was a spoof of hemp advocates. It was in the form of kind of a “Ripley’s Believe It Or Not” or other pseudo-educational comic strip. There were four panels arranged in a square, and one of those panels said something like:
“Fun fact: George Washington drove a car made out of hemp!”
Does anyone have a clue what this might have been?