Yesterday, 06:33 PM
I was totally wrong when I predicted the direction the zombies would probably come from.
Assuming for the sake of argument this were true I imagine your lungs would still expulse CO2, but they just wouldn't perform the exchange, because the iron would already be oxygenated. The lungs would just sit there and "seep" CO2. Probably way less efficiently if you aren't 'beating' your lungs. You would probably need to operate your lungs just to outgas the CO2, but this still has some remarkable consequences. A diver could exhale into a tiny hydraulically pressurized CO2 scrubber and inhale something super-compactable like helium, as long as they kept some of this stuff on slow IV and had a way to eat they could stay underwater for DAYS.
An even bigger impact would be in space. Imagine being able to run a pure Nitrogen atmosphere and just scrub out the CO2, you get all your O2 from a semi-implant tank. That wouldn't happen, but having this tech could extend survival in space for days if not weeks. In a bad atmosphere all you'd have to do is filter out toxins, not find and meter O2 from somewhere. Makes it a way easier problem.
Mostly though, I think this tech would be for stuff like severed limbs that will be reattached, or organs requiring extraordinarily long transport, or first responders expanding the window of survivability.
If it turns out this stuff is real, and it has side effect like ibuprofen, then ultimately I would expect to see it as the 'immediate response' be nearly any first responder if for no other reason than to stop the clock for fifteen minutes as they close the gap to the ER.