I am using a Masterbuilt smoker Just moved: The new house has 3 small fruit trees that are dead. 1 cherry, and 2 plum trees. I read about these varieties of wood. My questions are: [a] Can I just use the small branches cut in small lengths to put into the smoker . The property also has 2 Black Walnut trees. The branches have a green lichen on some of them. Can I use the small dead branches with the lichen on them? [b1] The wood guide says use only a little bit of Black Walnut as it is an overpowering wood. Any comments?