[Hiccup pauses to look at her curiously, when she says that it smells like something passed through over a day ago.] How can you tell? Is this like- is it magic, or something? [Or does she just have an enhanced sense of smell like that?]

Uh, yeah, maybe? If it is, there are a lot of them, though. Different colors, too. We could definitely bring some of this back. I bet they could be used in lanterns or something, maybe.