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Re: You said it, Si!
The volume of rebreathed gas has a physiological name - the dead space. Knowing how the volume of the dead space changes with by mask type is a fundamental requirement when designing any ventilator tubing. Look up Mapleson Circuit for a classification. A loose fitting mask has a negligible effect on the dead space.
You may find the experience of rebreathing warm moist air unpleasant but one thing that categorically isn't happening is a depletion in your oxygen level.