Combine the paprika, garlic powder, onion powder, chili powder, freshly ground black pepper, cayenne pepper, celery seed, and kosher salt in a small bowl.
Remove the silver skin from the back side of the ribs and pat them dry with a paper towel. Rub the dry rub all over the ribs.
Place ribs in foil and wrap. Store overnight in the fridge to marinade (optional).
Start the smoker and get the temperature to around 225°F. We have a Traeger and it works great, but any smoker will work. For wood, we typically use the Traeger Texas blend or oak pellets, and then hickory would be our next choice. Fill a disposable roasting pan with water and set it on the smoker to create humidity. You will want the water pan to be full during the smoke.
Cook the ribs in the smoker at 225°F for 5-6 hours. Baste the top of the ribs with Kansas City BBQ Sauce during the last 30 minutes of the cooking time.