I've talked to Shiinen, it was a misunderstanding. She meant regular poisons that would affect humans and such. Undercooked food, spoiled meat, etc.

I honestly figured we were all sort of resistant to that stuff as it was, since we're half demon/spirits etc. She actually did not see that the villain was poison based. Still, obviously, up to Viridian, but this definitely removes my worries about it.

Also, my nickname list keeps growing...