When wood air-dries naturally not only does water leave but other substances break down over time through oxidization. If green wood is dried rapidly, the water leaves but other substances remain that would normally dissipate with a natural air dry. I can't speak to how more or less corrosive they are to metal when burned though. My guess would be that it's negligible. Maybe you'd have to replace the chimney every 15 years instead of 20?
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