I found this truly bizarre.
Parasitic worms have an endocannabinoid system that may help the worm and host survive by reducing pain and inflammation in the host.
Endocannabinoids are natural cannabinoids produced by the body.
It may also cause the host to get the munchies providing more nutrients to the host-and the worm.
Another interesting find is that one study reported that black truffle mushrooms make anandamide, a type of endocannabinoid, possibly as a mechanism to attract truffle hogs that eat the truffles and disperse their spores.
Really weird, Now that they're looking for cannabinoids they may be more common in nature then everyone thought. Even very primitive organisms may have receptors and uses for it.