Dr. Seuss knew his shit. All his books have a meaning, and green eggs and ham is about weed. First off, they’re green. Second, Sam-I-Am is shunning the green eggs and ham, doesn’t want anything to do with it or the people who eat it. Just like people in the world about weed. Finally, he tries it, and LOVES it. He goes crazy, and wants all the green eggs and ham he can get. And he munches out. Therefore, green eggs and ham = ganj.
Atta boy, Seuss.