Outdoor Magic Cherry Smoking Wood ChunksChunks burn more slowly than chips, and often a chunk or two about the size of an egg is all that is needed for a lot of food. Because they are slow, steady sources of smoke, they are in many ways, the most desirable. When you use chunks, you can add one or two at the start of the cooking cycle and you don't need to keep opening the unit and mess with the equilibrium in the cooking chamber's atmosphere.