In Korra we see that a Spirit tells Korra that vines and spirits are the same thing. So if a human eats the vines they are basically eating spirits. In the Shadow of Kyoshi Novel we see an example of a human eating a spirit when Yun, the false Avatar, ate Father Glow-Worm. Yun gain a ghastly aura around him and a boost in his Earth bending abilities as well as the ability to burrow between the Spirit and Material world. So in theory if a human ate Spirit vines they would become human-spirit hybrids and attain special abilities attributed to the Spirit vines. The Spirit Vines covering Republic City were created by Vaatu and are thus as extension of Vaatu’s influence on the Material World. So in theory if someone were to eat Spirit vines from Republic City then they would gain some attributes of Vaatu such as his purple spirit beam, ability to propagate plant life, a dark aura, flight, or even Waterbending (since Vaatu and Unalaq become one). There are so many possibilities. Would eating the Spirit Vines from the Foggy Swamp and in particularly the Bayon Grove Tree have different effects since they are not from Vaatu and according to Baatr Jr have high spiritual potency then that of Republic City? Possibly since the Swamp makes one see illusions and have visions then that’s an ability that Vine Eater might possess; illusion creation and possible mind control or mind reading. Please give me your thoughts.