Most people don't use log burners properly, and create unnecessary smoke. Apart from using suitable wood, they need to be run on secondary air (no primary air) once they're going. If the wood is reluctant to burn without primary air, it needs further chopping or drying.
An appalling practice is to bulk up the fire, turn the air right down, and let it smoulder overnight. This turns it into a smoke/soot/CO machine. Unfortunately it's also SOP in many homes.