My wife & I are fixing up an old row home in Baltimore. With the on set of cooler weather and the windows being closed more often we have noticed a very heavy smoking smell. Like ashtrays left over from the night before. We are not smokers but our common wall neighbors on both sides smoke incessantly. Apparently, this is the source of our problem. The 10'x 10' foot room off of our master bedroom that we planned on using as a walk in closet/dressing room is the worst. Right now we keep a fan going in a window to pull the smell out but that will not be an option come colder weather. Has anyone experienced this problem and have any suggestion?