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Wait, is this real? The summary makes it sound like carbon monoxide, in small doses, is actually a good thing and necessary for our bodies. Is that true? Is it possible for someone to die from an internal CO build-up as a result of an overactive metabolism or something?
In chemistry, you'll find the dose is the most important factor. Also, I don't think it would be possible to super saturate your body with carbon dioxide or monoxide even if you purposely ingested something and then reacted it to break it down into those gases internally. I'm certain you would increase the concentration in your blood, but your lungs have far more surface area and tissue dedicated to gas exchange then your guts do. You would probably have terrible bouts of gas from both ends though.
Isn't one of the main issues with carbon-monoxide that hemoglobin preferentially binds with it over oxygen, and so it doesn't get expelled from your bloodstream via your lungs? You can tolerate quite large doses with little more than a headache, so I doubt you could overdose from internally generated amounts, but a large enough dose dangerously reduces your blood's oxygen carrying capacity.