I just cleaned my WSM before my next smoke. There were some leftover coals that looked new so I fished them out for my next cook. Is this "taboo" or do coals that remain and not completely ashed still usable to cook with?
Wayne,
You can reuse the charcoal. I do it all the time. After a cook I will close the vents and normally have some briquettes left. I use those briquettes in the chimney to start the fire for the next time.
Lance
The only time I don't like to use the unburned charcoal in the next cook is when it was used for cooking direct, such as chicken cooked without the water pan. Even that may not be an issue.