Mothers give their babies a booster shot of cannabinoids in their breast milk to give them the munchies because they have to learn to eat. (they've been fed thru the umbilical cord and did not have to know how to eat.)

Activity in the evolutionary advanced areas of the brain is increased in cannabinoids receptors and promotes higher consciousness levels.

Also, when ingested, delta 9 THC, on the first pass thru the liver, changes into delta 11 THC. Five times as psychoactive and much longer lasting. I don't know how many people understand that...