Butterfly or "Spatchcock" chicken by removing the spine and rib bones and laying the chicken flat.
In a large gallon sized zippered bag, add all remaining ingredients less 2 tbsp oil. Add whole chicken to bag and allow to marinate in the refrigerator for at least 1 hour (up to 24 hours). Flip bag a few times to evenly marinate.
Preheat smoker to medium-high (around 325deg).
Add remaining oil to cast iron skillet over medium high heat. Place chicken (Reserve marinade), breast down, in skillet and cook for 7 minutes. Flip chicken and cook another 7 minutes. Add reserved marinade to skillet.
Cover skillet with foil and place in smoker for 1 hour. Remove from heat and let sit, covered, for about 10 minutes before removing to serve.