Curious observation. This year i took the plunge and had the chimney fully lined for my kent. Straight shot off the top of the stove and up a 2 story exterior masonry chimney. Liner is insulated and the install is sound...spent the cash to have a pro do it. Previously, i only had flex pipe up and into the first flue tile with a steel block off plate. The stove performance is great. Drafts better, burns hotter, starts easier. Glass stays clean, and there is nothing telling me that things are amiss. Except for the smoke. Every time i look at the stack, i see light grey or white smoke coming out of the top. I domt smell anything though, and it typically dissapates quickly. Previous to the full lining, all i would see are the heatwaves when i got up to temp. Fuel is biobricks, which rules out the whole unseasoned wood thing. Love to hear your opinion on this.