Originally posted by Khazz65:

The thing is smoke is appearing where it should not appear at all. For instance, one building has smoke coming up from the base floor in a stone building 2 rooms away from the fire source. There is even a wall between it. This spot literally has zero chances to have smoke, yet it does even after I destroyed the fire source. I have only seen these issues on the 1st floor of buildings also.

If it is truly smoke, not fog, I'd submit a formal bug report.