A smoking fireplace is the result of chimney draft issues. In this context, draft refers to how the air flows up the chimney. Indoor air pressure affects this air flow. The air inside your home pushes air up the chimney, like a vacuum. Good draft conditions allow vented smoke to travel up the chimney quickly, while poor draft conditions can cause smoke to billow back out into your home instead.
Negative pressure planes are typically in the lowest part of your home, while the neutral sits above that, topped by the positive plane in the higher portions of the home. These planes shift and help air flow through the home, with many experts recommending at least six full air exchanges daily. In short, you might not have enough air from the exterior flowing in and up through the home.
If it draws better, you might want to consider an exterior air supply vent in your fireplace to improve airflow or look at ways to fix this through your home. Exhaust fans running in your kitchen or bathroom can also create negative pressure that prevents your fireplace from drafting properly.
A blower fan for a forced air heating system can also cause negative pressure, especially if there is a furnace return vent in the same room as the fireplace. The direction of the smoke once it exits the chimney is totally dependent on the weather, winds and atmospheric pressure. You will notice that the smoke will go up when the atmospheric pressure is low, and will linger or drop in high pressure.
Raising the flue temp would require they open the damper and burn the wood more rigorously. This is often counter productive and sucks more heat out of the house than it puts in. Also in the case you site, a single wall metal flue could become extremely hot, especially close to the firebox. The smoke will exit the flue more vigorously, but not necessarily raise far enough before it cools to cure the problem.
Here in Maine where many folks heat with wood, the exhaust smoke is becoming an issue in more densely populated areas. There have been many stories on the news, and experts talking about new wood burning technology, but no one has found a way to reduce smoke pollution from older units, airtite stoves or folks that burn damp, or not fully dried wood.
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