Our ancestors have used fire for more than a million years. Wood smoke is not good for the lungs, but our ancestors were depended on fire. Especially in colder regions of the World like in Europe, where people would have been sheltering in closed spaces like caves or tents, the exposure to smoke would have been significant. I've been in Arctic regions and been inside tents used by indigenous people. They use woodstoves inside tents, and while there is a chimney, the concentration of smoke inside is huge. After a while your eyes start to burn.
So, the question is whether after tens of thousands of generations living in such conditions our lungs have evolved to neutralize the damage done by wood smoke to some degree?