I've been getting a little smoke coming out of the seams and on top by where the vent pipe meets the stove on my brand new Jotul 500 Olso. This happens during start-up in the AM and when it cools down at night. Not too much smoke at night, but I've seen puffs coming out. I had to buy 2 top-of-the line air purifiers and run them all day as long as the wood-burning stove is on. Jotuls are not sealed fireboxes, and I'm having a hard time with this--as most new wood stoves are not sealed nowadays--thanks to the idiots at the EPA in Washington, D.C. You'd think they would have addressed this and that if these boxes are smoking during the night and you're breathing it, sooner or later there are going to be lung problems (e.g., lung cancer for one). I did not know this problem after doing a ton of research on the Jotuls and other stoves. I had an Avalon for over 23 years and never had this problem because it was a sealed cast iron box. I miss that wood-burning stove and couldn't bring it when we moved. I wonder if anyone has made complaints to the EPA about this issue on all these new wood burning stoves? Or, is it that the EPA is trying to do away with them?