We need to talk about the invisible deathtrap that is CO2 canisters

[Flourish]

I just experienced CO2 poisoning last night, and it was very quick and didn't have any indications at all! I didn't cough, and the O2 marker didn't show up until I was knocked out dying. Similar to hyperglycemic shock, it's pretty unfun, especially since once you're down, you're usually down for good. I think the suggestions people have about making the signs clearer is good. I get not wanting to make things super duper obvious, but I definitely do think that the current effects should be improved.