In the 1960s, one of the many surprising issues NASA faced during the space race was none other than the humble fart. Astronauts blow raspberries just like anyone else, which can be a bit of a problem because the methane in farts is just as flammable in space as it is on earth. Although "lighting your own farts in space" sounds like the winning entry in a 12-year-old's "coolest ways to die" list, NASA didn't feel like decimating countless millions' worth of equipment because Steve the Idiot Astronaut is big on leftover chili.
Pixabay Public Domain
"Fuck you, Steve."
Part of the issue can be solved with proper diet, but there's always a few silent-but-deadlies sneaking under the radar, and they don't really go anywhere in zero-G conditions, because there's no convection. They just stay there, air bubbles of turd-gas hovering about like space mines. It's not such a huge problem when there's only a handful of professionals on a carefully restricted diet around, but when we start mass space travel ... well, let's just say that the space equivalent of the average person's Cheetos-and-burgers diet isn't going to bode well for the general odor of the place, let alone fire safety, when you multiply it by thousands. That's your future: Hordes upon hordes of people spewing anal gases from their terrifying cavities until the air turns brown. The inevitable purging fire will seem like sweet relief.