Nice job; like previously stated, I sure wish they put basements in California houses. Also I agree about the closet. To me, a closet in a smoking room *must* be meant as a walk-in humidor, eh?
Last, don't forget about a fresh air inlet; otherwise when that exhaust fan is running you'll be drawing the room down below atmospheric pressure and air will find it's own way in, and not necessarily where you want it to!
Really Cool!! Congrats!!!