jbird5784 - Wood chunks of identical size can vary in weight based upon wood species and within a particular species moisture content. Also, heartwood is denser than that closer to the bark and will be heavier. Depending on what I am smoking, I find 3 to 6 ounces of wood produces plenty of smoke flavor. It is easy to over smoke meat, that is so much smoke that the meat becomes bitter. An inexpensive digital scale can help you avoid the bitterness and fine tune the smoke profile to your liking with repeatable results. Just split the chunks to the weight you want.