Was it fire or the smoke?

We all know one of the biggest discovery of the humankind is the FIRE! From there onwards its conceived, started the evolution of the intelligence. We've attributed a lot to the fire for the humankind!

Which makes me think! Was it fire or the SMOKE! It was also the discovery of the smoke! I wonder why no one paid any attention to this fact.

I know what you will think! Until and unless you are aware of the wisdom that brings, the smoke!

Anyway what about all the smoke inhaled by our ancestors sleeping in the caves with fire at the entrance! See my point!!