What happens when more oxygen than necessary enters the lungs through vigorous and deep breathing?

According to Osho, even with vigorous, deep breathing the body cannot absorb 'extra' oxygen at will. Only a limited portion of the lung’s thousands of pores actually receive oxygen—about one to one‑and‑a‑half thousand in a healthy person. The remaining pores stay inactive reserves, so overbreathing doesn’t meaningfully increase uptake; the system self-regulates and takes only what’s required.