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While reading this - Surviving under water in air bubble - this question came to me:

How long can an adult person survive on breathing in only exhales of another adult person? Can this be even calculated by not relying on rough approximations or there are too many variables?

In order CPR (mouth to mouth breathing part) to be effective, logic says that exhaled "air" is not poisonous to bring a fatal blow, but for how long?

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