My good friend has been burning in a wood stove for 25years or more. Knows what he's doing, like many of us. Last night he awoke to the smell of smoke and just thought the stove had burped. No big deal but fortunately for him and his family he didn't fall right back to sleep. Finally as the smoke got worst he got up and found that the black pipe (6" long) from the stove to a clean out tee had somehow came apart and all the smoke and fumes were venting directly into the rooms. Two lessons to be learned: Always screw pipes together or use locking collars, and working smoke or co detectors in the house may be a pain but they save lives. He had neither and could easily have made the evening news.