This theory appeared recently on Facebook in the form of an open letter to the Australian prime minister. At least I think it did, because Facebook deleted it, it seems, because they are deleting all posts about COVID-19 except official ones. Certainly all of the "I am a medic and this is what you need to know about COVID-19" posts that were so common in the early days of he pandemic have disappeared.
Regardless of Facebook's censorship, the idea that the virus makes us poison ourselves with carbon monoxide is an interesting one. It is not as if anyone else has come up with a mechanism by which the symptoms of the virus arise and CO poisoning has such similar symptoms to COVID-19 that websites of keeping safe from CO describe the symptoms of poisoning as "like COVID-19".
Whilst looking for the censored post, I came across this which is also interesting. It's dated December 2016 and I don't know how far the scientists have got with their cure for CO poisoning, but if COVID-19 kills by CO poisoning and there's a cure for that, then there's a cure for COVID-19.
That is, of course, if it doesn't end up in the "Not Invented Here" black hole.
