Preheat the smoker to 270 degrees F.
Pat the ribs dry. Remove the silver skin from the back if it is still attached.
Mix the dry rub ingredients in a small bowl and coat the ribs on all sides.
Place the ribs in the smoker, meat side up, and cook for 2 1/2 hours.
After the first 45 minutes, mix the baste and begin basting the ribs lightly every 30 minutes.
Wrap the ribs tightly in aluminum foil and return them to the smoker for 2 more hours.
Unwrap the ribs and place them back in the smoker for 1 final hour.
If using barbecue sauce, brush it on right before the final hour.
Rest the ribs for 10 to 15 minutes, then slice and serve.