I've vented the smoke out the top of the back wall to prevent "liquid smoke"' aka creosote, from dripping onto my goodies, but I'm wondering if I may end up with a clogging of the arteries in my exhaust pipe. Any experience with this anyone? Here's a shot of what I have. It's 2" black pipe. As you can see in the pic, I already have condensate building up on the inside of the vent... Not worried, just curious.