Hello All, We have an Earth Stove that we have been using with no problems for 5 years. This is our main source of heat. The it is getting cold here in the mountains with night time lows around 17 degrees. We have been using the stove sparingly because of a recent smoke problem. As usual, I start the fire, let it burn hot, load it up, shut it down slowly (two notches on the flue at a time) for the night.... the way I've done it for the last few years. This season we've had the worst smoke problem I've ever encountered, ever. After we have had the fire burning slow and steady for a couple of hours, it puffs smoke our of the door! It's only one or two puffs and then stops. Sometimes it puffs again in a few minutes, some times in a couple of hours. If I catch it, opening the flue all the way and slowly shutting it down again will relieve the problem for a little while. I just can't stay up all night adjusting the air. If I let the fire rage, there is no problem. If I let it burn during the day at the middle setting, there is minimal smoke. When I shut it down for the night, it there doesn't seem to be a problem until I wake up in the middle of the night to the smoke detector going off and a house full of smoke..... The chimney is clean, there is no chimney cap (there hasn't been since we moved in), there are no vent fans running, the stove has a blower that runs, the house is very drafty. I have read through the forums searching for answers to my smoke problem. . . I can't seem to find the answer.