How could my humanoids metabolize smoke?

I have a species of humanoids that spends a lot of time around fire. They are able to spark their own fires, and they have a reasonable fire resistance. One problem presenting itself is smoke inhalation.

These humanoids are genetically engineered, so evolution isn't a problem. They don't have to worry about poisoning from many substances due to a modified renal system and some helpful bacteria. I am open to any changes, biochemical, etc, as long as they fit within a human shape.

In particular, I am wondering if they could inhale smoke from fire and absorb its components, such as carbon and water vapor, for use in their bodies. What changes to their respiratory system would have to occur? Could they breathe carbon monoxide and carbon dioxide?

Would the use of smoke in their metabolism just be too inconvenient or detrimental to be implemented?

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How could my humanoids metabolize smoke?

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