Something seems a little bit off in this cost-benefit analysis to me. You seem to compare the tiny tiny cost of delaying one breath to the sizable accumulated impact of 1 billion people doing this for a year. But that is not really helpful to get an intuition. The tiny tiny cost of delaying breathing once will also accumulate if 1 billion people do this for a year.
Of course, it is still possible that the accumulated cost is lower than the accumulated benefit. But in a way, this whole accumulation does not matter. All that matters is if the cost is higher than the benefit.
Something seems a little bit off in this cost-benefit analysis to me. You seem to compare the tiny tiny cost of delaying one breath to the sizable accumulated impact of 1 billion people doing this for a year. But that is not really helpful to get an intuition. The tiny tiny cost of delaying breathing once will also accumulate if 1 billion people do this for a year.
Of course, it is still possible that the accumulated cost is lower than the accumulated benefit. But in a way, this whole accumulation does not matter. All that matters is if the cost is higher than the benefit.