Slice pork belly into 1" x 1" cubes.
Toss with avocado oil, then season with BBQ rub.
Smoke at 250 degrees with apple wood for 45 minutes, then spritz with vinegar every 30-40 minutes.
Prepare Chipotle Honey Sauce by mixing all sauce ingredients.
After 2-2.5 hours of smoking, toss pork with butter, brown sugar, and sauce in a foil pan.
Cover and smoke for another 45-60 minutes.
Let rest for 30 minutes before serving.