It is often reported that nitrogen is the most prevalent gas in our atmosphere. For example, Wikipedia says it makes up more than 70% of Earth’s gaseous layer. These claims are often repeated uncritically.
Studies show that the human body absorbs very little nitrogen in the course of respiration. Almost all of the air molecules absorbed into the body are oxygen.
It is clear from these data that statements about nitrogen “dominating” the atmosphere are not only exaggerated, but simply false.