Make the smoke bombs: Add the wood chips to a bowl and cover with water. Let soak for 1 hour, then drain. Place 1 cup of the damp wood chips on a piece of aluminum foil and fold into a packet. Poke multiple holes in the top with a toothpick or fork. Repeat with the remaining wood chips, creating 4 packets total.
2. Step
Make the sauce: Add the ketchup, brown sugar, molasses, apple cider vinegar, Worcestershire, salt, pepper, and smoked paprika to a small pot over medium heat, whisking to combine. Once the sauce begins to boil, reduce heat to low and simmer for 15 minutes. Remove from the heat and let cool to room temperature.
3. Step
Make the rub: In a medium bowl, whisk together the brown sugar, salt, pepper, cumin, onion powder, paprika, cayenne, ground mustard, and garlic powder.
4. Step
On a large cutting board, pat the ribs dry with paper towels. If necessary, remove the membrane on the bone-side of the ribs by using a paring knife to gently loosen and pulling it up in one sheet.
5. Step
Generously season the ribs all over with the dry rub.
6. Step
Wrap the ribs in aluminum foil until completely covered.
7. Step
Preheat the grill to 300°F (150°C) with the lid closed.
8. Step
Place the foil-wrapped ribs over indirect heat and close the lid. Cook for 2½ hours, until the meat is tender and starting to pull away from the bone, flipping every 30 minutes.
9. Step
Remove the ribs from the grill and let rest for 10 minutes. Meanwhile, carefully remove the grates and place the smoke bombs over the flames. Close the lid and let smoke build up for 10 minutes.
10. Step
Unwrap the ribs and discard the foil.
11. Step
Baste one side of the ribs with the sauce and place directly on the grill, sauce side down. Baste the other side, now facing up. Continue to flip and baste every 5 minutes for 15 minutes total.
12. Step
Remove the ribs from the grill and serve with extra barbecue sauce.
