It depends on your smoker, the temperature of the fire, how much and how long you want the smoke to deliver, and what you are cooking. Always follow the manufacturer's instructions for how much to use. For chunks, I will generally add 3 to 4 chunks to the charcoal. For chips, add 2 to 3 handfuls per hour of smoke. Pellets burn at a rate of 1/2 pound to 2 1/2 pounds of pellets per hour, depending on the temperature level set.