Mikey B,
You never mentioned if the duck was a wild or domestic duck. I never smoked a domestic duck or goose but here is a recipe I have used in the past many times. I would imagine domestic fowl would work just as well.
I have smoked countless wild ducks and Canada Geese using this recipe and it is delicious.
Matinated and Smoked Wild Goose/Duck
Marinade:
2 C Soy Sauce
1 C Brown Sugar
2 t Black Pepper
2 t Garlic Power
1 t Cayenne Pepper
1/2 t Ginger
And enough water to cover the bird or breasts depending on what you are smoking and place marinated bird in the refrigerator.
I have another fabulous marinade using red wine if you desire. PM me if you want that one instead.
Marinate the bird for at least eight hours.
Smoke the goose/duck at 200˚to 225˚ for one to two hours until the internal temperature is 165˚- 170˚ F. Try not to let the bird smoke too long or it will dry out and the sugar from the marinade will scorch.
Enjoy,
John