Keep hot fire going. Use seasoned dry wood or split the green wood smaller and mix it with dry wood. Reduce the cross sectional area at the top of the chimney or install a stovepipe through the center of the chimney. Check flue liners. Install a smoke shelf in fireplace.
Smoke comes out of one fireplace while another wood stove or fireplace is in use.
If each appliance has a separate flue, there may be smoke leaking from an adjacent liner to the liner serving the other appliance. If the flue height in adjacent liners is equal at the chimney cap, smoke can be pushed or sucked down another liner. Either disconnect one appliance or plug the fireplace opening if two appliances are sharing same fireplace flue. Change height of nearby flues extending out the chimney. Take a Haunted Holiday Parlor Tour of Lafayette Square in St. Louis, a neighborhood of restored Victorian mansions.