Preheat smoker to 250–275°. Aim for a very mild smoke—almost clear in color, if possible.
Rub a generous amount of the rub on the meat side of the ribs and let rest for 20 minutes to give the spices time to penetrate the meat.
Place the ribs in the smoker, keeping the heat between 250–275° for 1 to 1½ hours. Check the meat between the 3rd and 4th ribs. When this softens up, you should be able to pinch your fingers (wearing heat gloves), causing the bones to separate. This is how you will know they’re ready. If they are stiff and rubber-like, put them back in the smoker for 25 minutes and repeat until the ribs are at the desired tenderness. This could take up to 3½ hours. Pork ribs should have an internal temperature between 190° and 200°.
Place the ribs in a pan and cover with a lid. Let rest for 20 to 30 minutes to allow the juices to redistribute before slicing and serving.