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Creosote 101: What It Is, Why It Matters, and How to Treat It If you heat your home with a wood stove or fireplace here in Greenville, Maine , you’ve probably noticed a sticky, tar-like substance forming inside your chimney over time. That’s creosote  — a natural byproduct of burning wood — and it’s one of the leading causes of chimney fires  across Maine each winter. Glazed Level 3 creosote on the chimney When smoke cools before leaving your chimney, it condenses and leaves