[NO Zelos, that's cheating. The Once-ler's frown deepens]

I don't know. If the people in Thneedville had to buy their air supply, it must have been pretty darn bad for them. And they're just regular humans. I don't know what effect the smog would even have on you.

[That's his roundabout way of saying there's a slight chance you might die out here, Zelos. But he doesn't want to say that out loud, in case he makes it true. He doesn't want to lose anyone friend though his own stupid, careless actions]