When I left school in the late sixties, I had a job working in a computer section. One room to a side of the building housed three rampant chain smokers. The door was always closed and (for some reason) the windows we taped up so they could not be opened. The sat in this fog filled room all day puffing while working. As you can image no-one ever went in there. Even the heavy smokers from elsewhere in the place could not stand more than two seconds. I wonder if their homes were the same.