@Wyrm Poison and whatnot are probably qi-based effects that are more about fucking you up metaphysically rather than anything that depends on your actual physiology and metabolic processes at this stage, provided things work the way they do in other cultivationshit stories. As for mental status...
I'd probably just use it to harass my monsters by whispering inane shit like "Psst, your dick is showing" or "You're now breathing manually" until I level the skill up so I can do images so I can just directly project scat porn into their heads all the time.