Preheat the smoker to 225F. In a small bowl, mix the spices with the sugar and a pinch of salt and pepper.
Pat the chicken breasts dry with a paper towel.
Sprinkle the spices onto the chicken breast and rub it all over.
Lay the chicken out on a baking sheet and place it in the smoker to smoke for 50 minutes to an hour, or until the internal temperature is 165F.