Each bar of it is like carbon monoxide

from Elzhi (Ft. Royce Da 5'9") – Glow Lyrics on Rap Genius

Meaning

Carbon monoxide is a very dangerous compound that, in it’s gaseous state, will suffocate someone if they are exposed to a large amount of it in a confined area. So basically, it can be considered poisonous and makes people sick (from oxygen depravation). So his bars are sick.

Additionally, if there’s no oxygen, people can’t breathe. So also, his bars will take your breath away because they’re so good.

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