Too much oxygen??
When Jammer freaks out because he is a wuss and goes into convulsions, Coffey says he is getting to much oxygen. That is true, it can happen. It's called Oxygen toxicity......
https://en.wikipedia.org/wiki/Oxygen_toxicity
How many people also know that you can die from drinking too much water? It's called water intoxication..
https://www.scientificamerican.com/article/strange-but-true-drinking-too-much-water-can-kill/