Whisk together the brine ingredients until the salt has dissolved. Pour over the chicken.
Cover and refrigerate overnight.
Fire up your smoker for 225 F cooking. Use whichever wood you prefer (I went with apple).
Remove chicken from the brine and rinse with cold water.
Pat dry then sprinkle liberally with the rub on both sides.
Tuck the skin underneath of the thighs and transfer to the smoker.
Smoke for 2 hours or more until the internal temperature has reached 165 F.
If you wish to sauce your thighs do so in the last 15 minutes of cooking.
Notes
Smoked skin-on thighs will not have a crispy skin because of the low cooking temperature. I prefer to remove the skin, pull the meat away from the bones and chop for sandwiches.