I've smoked briskets serveral times in my cookshack. Always put a piece of charcoal in with the wood, but still can't get smoke ring. After 12 hours of smoking, what should the wood look like. The piece of charcoal and the wood are black but still intact. Should they be ash or is this normal. My brisket has smoked flavor. but the smoke ring isn't there. Some suggestions would be great!