The Kapn gave what sounds like a good idea, I have tried masks and they are a pain in the arss, this from someone that has been a spray painter for many years of my life.
Set on a table or chair behind or off to the side and turn it on just before opening the pit and off again when done or the fire may spike up from the added wind. I have often wondered about adding an exhaust fan like some larger more expensive smokers have.
MY DEFINITION OF AN OPINION.
I can only give credence in facts I believe factual. If those facts are wrong, and are proven as such by facts, I must only give those facts credence, if I believe them as factual.
When the going gets tough, I take more fiber.