Preheat your smoker to 250 degrees, using a blend of hickory, maple, and peach chips.
In a small bowl, stir together all of the ingredients-- except for the chicken.
Dip each chicken breast into the mixture and use your fingers to gently massage it in. Repeating until all the breasts are coated.
Place the chicken breasts into the prepared smoker, placing the thermometer prove into the center of the thickest one. Baste them every hour with maple syrup.
Cook the chicken about 3 hours, or until the probe registers an internal temperature of 160-165 degrees.
Remove the chicken from the smoker, to a serving platter. Baste again with syrup. Serve immediately, or store in an air tight container and heat up when ready to serve.