...Well, that sure is a way to start a conversation. By now, though, Ginko guesses he shouldn't be too surprised by that, coming from Foster. At least this is... probably better than having him just assume it is weed.

"Well... that's because it isn't, actually." He finishes rolling the cigarette and sets it aside, then drops more components into the mortar. "This is mushi repellent. If you've seen those floating, glowing creatures around the carnival - it's to keep those from gathering too much."