No the users are air, and some are oxygen, and some are carbon monoxide. A few are hydrogen cyanide.
I'm nitrogen (necessary to keep the oxygen healthy) 😂
I am not very good at chemical elements, but I hope that you understand me, what I really wanted to say by this, and just transferred to a joke.
Yeah its more of a metaphor.
Cyanide is poisonous along with carbon monoxide. Oxygen is healthy in the right concentrations.