@Pat In my experience smoke also just hangs there with gravity... Or at least a lot longer than I like to when I'm standing next to a damn smoker. :p
Yeah, this was a joke, but I just turned it into a puzzle and posted it to the local timeline. (regular Earth gravity, but no air)
I had to delete/re-edit that original toot. Here's a link to the new one. (Only one day left!)