If you don't have time to get some Simply Marvelous, here's a rub I've used for years.
Chicken Rub
2 teaspoon paprika
1 tablespoon brown sugar
2 teaspoon dry mustard
1/2 teaspoon garlic powder
1/2 teaspoon celery seed
1/2 teaspoon thyme
1 teaspoon kosher salt
1/2 teaspoon ground coriander
1/2 teaspoon ground marjoram
1/2 teaspoon cayenne pepper
Combine all ingredients in a jar with a tight fitting lid and shake to combine. Apply liberally to chicken, rub into pieces and tightly wrap chicken in plastic wrap. Marinate in refrigerator for at least 24 hours. Smoke according to your favorite recipe and enjoy!