>I couldn't understand how ~2 million years of evolution with woodsmoke hadn't rendered us completely immune There's strong evidence for use of fire going back

>I couldn't understand how ~2 million years of evolution with woodsmoke hadn't rendered us completely immune There's strong evidence for use of fire going back only .5 million years. More importantly, all existing humans are descended from a population that lived in sub-Saharan Africa till 70,000–50,000 years ago: https://en.wikipedia.org/wiki/Recent_African_origin_of_modern_humans#:~:text=present%2Dday%20humans%20outside%20Africa%20descend%20mainly%20from%20a%20single%20expansion%20out%2070%2C000%E2%80%9350%2C000%20years%20ago https://en.wikipedia.org/wiki/Recent_African_origin_of_moder... Although that population probably used fire before migrating out of Africa, they probably did so only for cooking and to keep wild animals away and almost never used fire indoors.