The Dangers of Poe's Mercury Exposure

Poe did not have the levels that would be associated with mercury poisoning. He just had too much mercury, but wasn't that a thing though? I mean, the whole expression of mad as a hatter, like you would kill you, but it would maybe make you a little off, right? Yes. That was part of, it's part of the danger. And then people are saying, maybe he had carbon monoxide poisoning because that's dangerous and they used cold gas to light things indoors. This doesn't seem likely for some pretty basic reasons, right? Everybody else is in the room. Nobody else is outside the semi-conscious, right? Was he just huffing