Smoke problems from draft in your fireplaces and chimneys may occur for a variety of reasons. Clogged chimneys, dirty or improperly fitted chimney caps, excessive creosote or firebox size are some of the many reasons for smoke within the home. Fans from your kitchen, bathroom etc. can also create a bad draft. Another issue one occasionally finds is actual air blowing down the chimney. Maybe the the chimney is short or if the house is located at the base of a mountain.