I noticed whenever I replace a building with one of higher quality while the original building is working (and smoking), the smoke stays permanently. The only way to get rid of it is to disable the mod, load the game and save, then enable the mod again.
I guess the problem is that my replacements are being done through certain modded ways, so the old building removal isn't properly recognized.
So what I'd like to request is a reset command, that removes all smoke entities on the map (or alternatively have the mod clean out everything when the save is loaded), so we can get rid of lingering smoke that shouldn't be there.