What the holy hell are you dribbling on about?
The vaccine prevents over-reaction to the virus after it enters the body, and promotes the immune system eradicating it.
That's how they work.
And as for CO2 levels - exhaled air is over 100 times higher in CO2 than fresh air but is perfectly safe to breathe (it has a little less oxygen though)
It's not carbon monoxide ffs.
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