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.
Is referring to the contents of the flask not the habbit. That stuff’s basically paint thinner.