When a fireplace allows smoke to back up into a room instead of going up the chimney, it is usually caused by insufficient draft in the flue. There are many possible causes for a weak draft in a chimney. If there haven't been any changes to the fireplace lately and the smoking problem just began, it is most likely that there is a lack of updraft due to some sort of restriction or blockage in the chimney. The chimney restriction could be something as simple as not having th [...]
