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No, you would suffer incredible pain from being unable to evacuate CO2.
You know how painful it gets when you hold your breath to your physical limit? That's CO2 building up in your body. Just going hypoxic on its own isn't painful, the pain is the body's response to having too much CO2.
Yeah, hypercapnia is fucked. I'm actually testing a small CO2 gas generator (literally just citric acid added dropwise to sodium bicarb with an acid trap and a dehumidifying stage) as a means to kill pests on houseplants and did some reading on the symptoms to be safe. It is unpleasant. It's not the worst death I could imagine, but it's shit.
As an aside, the way that CO2 kills bugs is interesting. Basically, the excess CO2 (in the range of 10-80,000 ppm) causes their spiracules (i.e. the little holes in their exoskeletons they use to breath) to stay open. This causes them to lose moisture until they die of dehydration (usually in a matter of hours). All this happens long before they asphyxiate or suffer from any sort of acidification from the CO2. It's a bit fucked up, but all other means of getting rid of the pests on my partner's houseplants have failed.
I use hydrogen peroxide spray to nuke my house plants. It's a drastic weapon, but really cleans it out. Just make sure you dilute it or you will kill your plants. It's pretty much chemo for plants.