I'd be very careful of using any outdoor cooker indoors. Even though you've vented it outside, its obvious your smoker is still exhausting some smoke into your garage, which means it is also exhausting carbon monoxide into your garage.
Oh, what the heck.... a little carbon monoxide never hurt anybody. Oh wait...actually it does! Crack that door, man! If you're worried about your nuts getting cold, imagine how cold they'll be when you're laying in a box in the ground.