>>13641156Because of the volume of air when you exhale, they momentarily form an air picked with higher CO2 concentration, before it's dispersed through the pores and the sides.
Basically it just delays the flow of air enough to make you recycle your own CO2.
For most people they get used to it, but in my case, since what I do is mentally intense, and the brain is the organ that consumes most of the oxygen you breath, having my ability breath impaired is very distressful.
If I had an average IQ like most people, I probably would just get used to it, but having a high functioning brain means I can't compromise ability to breath.
