I think that when an avatar by the /bending avatar command is poisoned or withered (without them having low health) it should activate a heightened avatar state that is 20 seconds longer and double the strength of the old 1 than their normal avatar state, However, if the poison isn't going to kill them, ( By figuring out a way to get the duration of the effect from the player and the power of the effect) However if the poison is self induced it wouldn't work.
We see this when Korra was poisoned by Zaheer her avatar state was much more potent and lasted longer than all of her previous and further avatar states combined.
We see this when Korra was poisoned by Zaheer her avatar state was much more potent and lasted longer than all of her previous and further avatar states combined.