Masanobu Fukuoka[1] was able to get high yields of rice (top 5% in Japan) while only using natural methods of farming. Also, while other fields were left fallow, he got a crop of barley. So basically double the yields of any other farm.
Perhaps some of the smoke leaks out of the stove into the room.
Maybe a rocket mass heater[1] could help. It uses a thermal siphon to pull all the exhaust outside.
[1]https://en.wikipedia.org/wiki/Masanobu_Fukuoka