While I do have a backyard smoker, any BBQ can be adapted to add a little smoke flavour using readily available hardwood chips. See below.
SOME SUGGESTIONS FOR INDIRECT BBQ
If you are using your gas grill to slow barbeque your pork, place the meat on one side of the grill and use the burner or burners on the opposite side so that it is not directly over heat. Regulate the gas to keep the temperature at about 250 degrees F for slow barbequed flavor. The same technique can also be used with a charcoal grill, just keep the charcoal on one side and the meat on the opposite side.
You can add smoke flavor by soaking hardwood chips like mesquite, apple, cherry or hickory in warm water for about a half hour. A couple of handfuls will do. Wrap the soaked wood chips in a double layer of heavy duty aluminum foil and poke only two holes in the foil, one at either end to allow the smoke to escape. On a gas grill, I place the foil packets in a vegetable grill pan so that the packet is not sitting directly on the gas burner. On a charcoal grill, simply toss the packet directly onto the hot coals. You can add more soaked wood chip packets as they burn out, it all depends on how much smoke favor you wish to add. One or two of these packets replaced every hour should be enough for pork.