Anyone with two functional brain cells can instantly figure out that you can't eat marijuana for food. One does not have to be a Fascists totalitarian bootlicker to point out that as food, the stuff is utterly f***ing useless.
The plants put that THC toxin in there to PREVENT predators from consuming them, but for some reason, you dopers keep trying to outsmart the plants. In this case, the plants have more intelligence than do you. They are trying to KILL YOU by tampering with your biochemistry, and you are going "Wow! This weed is really good!"
Yeah, their plan is working perfectly.
There are many other ways for a thing to be "useful."
The plants put that THC toxin in there to PREVENT predators from consuming them
THC is a pretty weak toxin, which is why nobody ever died from THC toxicity as the result of smoking pot. What THC does well is mimic the endocannabinoids naturally produced by the human body.