Writetober, Day 2 - Companion of Destruction

Alright, here is day two! Once again, the prompt is not explicitly mentioned in the piece - you have to guess! If you get it before I reveal it at the end, please let me know - that way I can make future pieces either harder or easier! :D

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I am not the flame.

.

I am not the flame,

But I tell of it.

Flame devours all before it,

But what is consumed is carried by me

High into the sky above.

.

I do not consume,

But consume me, and beware.

My destruction comes in this way;

Breathing becomes, for you, unfeasible.

.

I am not the flame,

But the havoc I bring into the world

Can be far more nightmarish,

Spreading my indistinguishable reach

Further than the flame ever could.

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Did you get it? It's smoke!

Hopefully, that one was easier to get. See you in the next story (or rather, riddle, hehe).