Can it be done. Yes. Do you need a fancy smoker box? No. All you need is some tin foil, wood chips of your choice, and a fork. Pictures speak louder then words so see below.
Just a quick view of the rotisserie chicken cooking today. Notice how the edge of the drip pan is halfway over the burner. With the drippings and water in the drip tray set up like this the heat will evaporate the water and also smoke the chicken as the fat burns off at the edge of the tray. by setting it up this way you're also guaranteed that your chicken will not go up in flames!