Combine marinade ingredients (everything besides turkey legs). Put 3 legs each in 2 gallon sized zipper bags. Pour half of marinade into each bag. Let marinade at least 1 hour. (up to overnight).
Preheat smoker to 250degF. In your largest cast iron skillet(s) arrange legs and pour marinade over top. Cover with foil and place in smoker. Use two skillets if needed to keep the legs in a single layer. Let smoke for 4 hours. Remove from smoker and leave foil on until ready to serve.