A person would be unconscious within a few breaths and then die very quickly while unconscious. It is a gold standard method if you can access it at high purity. Obviously its extremely dangerous to others too so warning signs or use outside by a river or other open place is a must. This chap used it years ago (when easier to obtain) and his article provides a lot of detail.
that's just the chemical reaction when carbon monoxide reacts with the hemoglobin in blood.
"Carbon monoxide poisoning disturbs this physiological process hence the venous blood of poisoning patients is bright red akin to arterial blood since the carbonyl/carbon monoxide is retained, whereas deoxygenated hemoglobin is dark red and carbaminohemoglobin has a blue hue."
The problem with CO is that your body realizes it's a poison and will try to get rid of it. If you were to breathe pure CO you wouldn't have any oxygen and you'd lose consciousness pretty quickly. If there's any O2 at all you're body is going to start reacting.. violently.
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