Good day all, this is the first time I've posted here and am at a lost of why this happened. I've smoked multiple times on my Pitboss series 5 vertical smoker without incident. However, this time I wanted to smoke a piece of meat in the smoke position until internal temp reached 120. Once the meat reached 120, I wanted to baste the meat and saw that the outside skin was covered with ash. Would anyone know what could have caused this? It wasn't windy, wasn't cold. My only guess was that I used a different type of pellet (Mastercraft - cherry). Any help would be appreciated. Thanks!!