Firefighters: The perils of CO

“…new knowledge about CO poisoning suggests that chronic exposure to CO-induced free radicals may, in fact, be a major occupational risk factor for cardiovascular disease and early death. Furthermore, exposure to cyanide and other toxic gasses may compound the effects of CO in firefighters…”

https://firerescuemagazine.firefighternation.com/2009/03/20/the-perils-of-co/#gref