The night before cooking the turkey, place the turkey skin-side up on a large platter or roasting pan – anything fairly secure that will fit in the fridge.
Mix all of the seasonings together (this is a great all-purpose grilling blend, FYI!).
Drizzle the turkey with the oil, and rub the spice blend all over the turkey, using it all up. Place the turkey on the platter (or vessel) UNCOVERED in the fridge overnight.
About 6 hours before you’d like to eat, prepare your smoking setup. Smoke the turkey at a low temperature, 175F-200F for about 4 hours, checking the internal temperature with a meat thermometer after 2.5 hours and then every 45 minutes after that.
At this low temperature, plan for about 20 minutes per pound of smoking time. However, be mindful that the size of your turkey, your smoking setup, and how cold your turkey is at the starting point will affect overall cooking time.
The turkey is done when the internal temperature reaches 165F at the thickest part. Remove the turkey from the smoker and let it rest on a platter for 30 minutes (at least) before slicing and serving.