But first, why does smoking make you hungry?
"There are neurons in your brain that suppress hunger after you've eaten. When coming into contact with marijuana, the cannabinoids make these neurons flip, they switch over, ending up causing hunger, rather than eliminating it," Dr. Horvath said.
"Say you eat an entire Thanksgiving dinner, then come into contact with marijuana, and come back 45 minutes later ready to eat again -- this is not normal, from a systemic standpoint," he said. "But the reason is quite simple, really." Simple for a professor of comparative medicine and neurobiology at Yale University School of Medicine, maybe.
You're hardwired to get the munchies
Think of it like this: the cannabinoids are re-wiring the circuits in your body that tell you you are full. It's like if a mechanic went under the hood of your car and switched your brake and accelerator.
How exactly, it makes your hunger-pangs all topsy-turvy, is still a mystery for the most part. The research has led Horvath and his co-authors to the conclusion that munchies are strictly a physiological reaction, without any psychological influence, which was initially suspected in some munchies research.