Preheat the smoker to 225°F
Combine all of the ingredients for the dry rub in a small bowl. Whisk to combine and set aside.
Combine the ingredients for the spritzer in a spray bottle. Shake to combine and set aside.
Prepare ribs by trimming any excess fat and removing the membrane from the back of the ribs.
Season the ribs by first, rubbing a thin layer of brown mustard all over both sides of the ribs. Then, generously coat with the rub mixture.
Place ribs directly on the smoker grate and smoke uninterrupted for 1.5-2 hours.
After 2 hours, begin spritzing the ribs with the apple cider mixture every 45 minutes for another 3-4 hours.
After about 3-4 hours of cooking time, coat ribs in BBQ sauce and continue smoking, checking the temperature often until the ribs near the final internal temperature of 190°F.
Remove the ribs from the smoker and let them rest for 15 minutes before slicing and serving.
Serve ribs with BBQ sauce on the side.