I am interested to learn what exactly prevents the use of chimneys, since it does sound like it'd be helpful. A tangentially-related but nonetheless interestin

I am interested to learn what exactly prevents the use of chimneys, since it does sound like it'd be helpful. A tangentially-related but nonetheless interesting video of a guy making a hut with chimney from scratch: https://www.youtube.com/watch?v=mL3sho1CpkI https://www.youtube.com/watch?v=mL3sho1CpkI