Poisoned by the absence of poison

I will remain silent for few more days.

To explain: I've spent too much time underground (laziness, I should commit evil on the surface but noooo, there are still episodes of Married with Children I did not see...) so my glorious return to the surface ended with a lot of vomit and quick (and quite shameful) retreat back to my sewers. Yeah, I can't live without my beloved sewer gases and when I neglect clean air for some time it has these results.