Water steals useful heat
Combustion becomes cleaner as the firebox and fuel reach the temperatures needed to burn released gases effectively. Excess moisture delays that process and can keep the fire in a smoky, smouldering phase for longer.
Start Project BriefFire, Fuel & Live Cooking · Combustion answer
Wet wood forces the fire to spend energy evaporating water before the fuel can burn efficiently. The result is often slower ignition, lower combustion temperature, more smoke and less predictable cooking heat.

Combustion becomes cleaner as the firebox and fuel reach the temperatures needed to burn released gases effectively. Excess moisture delays that process and can keep the fire in a smoky, smouldering phase for longer.
Loading additional wet wood can compound the problem. Use properly seasoned fuel, establish a small hot fire and maintain adequate airflow according to the appliance instructions.
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