By the way, I find it worrying that whoever is responsible for adding Antibiotics to the game cannot into Antibiotics. They heal infections at the cost of making you more susceptible to future infections. THAT'S NOT HOW ANTIBIOTIC RESISTANCE WORKS! THAT'S WRONG IN MORE WAYS THAN ONE!
Ignore that. It's an old bit of description that never got cleaned up. IIRC I've cleaned it up in my Fungal Rework PR.
Phew.
Also, since I already started being anal about science, Smoke: since by now you noticed that when you breathe out, you don't exhale smoke, you don't even have to know chemistry to realize that Carbon Dioxide is not visible. Or toxic, in fact. Then what is in smoke?
Mostly stuff that did NOT burn completely. Certain chemical structures require much more oxygen than they should given their mass, so when they burn, they don't burn down to just CO2 and water. From the most basic, Benzene ring structure is a notable example. When you set them on fire, you get a shitload of smoke.
You know what else has Benzene rings in it? Paint (some kinds, although those kinds are notable for having Benzene ring in each monomere) and epoxydes (all of 'em). That's what makes a house on fire give off a lot of smoke (also, plastics).
You know what doesn't have a lot of those? Most of the stuff you will use as fuel for campfires. Coal, wood. Sure, coal contains impurities and wood contains some natural polymers that don't burn nicely, so you will get
some smoke, but if you use a normal, open air campfire, the amount of smoke you will get from either of those will not rise above the 'oh shit my eyes are tingling' level.
If you put a rollmat next to a campfire, your main concern should be the mat catching on fire, not carbon monoxide poisoning.
(Sorry, I know I keep going about that, but it bugs me to no end).