Anyone use Smoker boxes on gas grill?

I've done it but have never had a box big enough to last how long I want. I now wrap my soaked wood chips in a long piece of aluminum foil and place on the burner. For something quick, it gets a decent smoke flavor. If I want to do a butt or ribs and don't feel like breaking out a fire, I'll leave the grate off to where I can easily remove the spent chips and place more. Works pretty well low and slow if you can get the temp right on your grill.

I have a Weber Summit with a dedicated 5th burner for the built in smoker box. While it's bigger than most of those after market boxes, it only holds a couple of cups of chips/chunks. It works well, but you do have reload it occasionally.

It is not as good as a dedicated smoker for long smokes, but it is great if you just want to add some smoke flavor to grilled dishes that you are cooking slowly. I use it for chicken quite frequently.