Using a sharp knife, cut off the top skin portion and scrape everything down to leave a clean bone. Pull the skin downward, wrap the bone with foil to prevent it from darkening. Brush the drumsticks with olive oil and generously season with a spice mix.
Prepare the Kamado BONO grill for indirect cooking, ignite the charcoal starter, place the stainless steel cooking grates, and wait until the temperature reaches 140 degrees Celsius. Add smoking wood chunks, partially close the top and bottom air vents to maintain a steady temperature.
Place the drumsticks on the grill grates. Smoke for about 1.5 hours. Remove them, unwrap the foil, and dip each drumstick individually into BBQ sauce up to the bone. Return the drumsticks to the grill and cook for another 15-20 minutes until the sauce caramelizes. Enjoy!