Yet another source of the vapors is the office itself. The ducts are also smaller, and so on. SOOO, all those cute chemicals have a lot of time to sit in your lungs. The larger volume of air required for smokers also results in far more clean air coming into a building. Much of this new, clean air comes in by design, where air is drawn in by vents.
Air also comes in through doors and windows.
The increased incoming airflow also results in more air going out, along with all the stale, chemical laden air. Another direct CRT confound is that the screen creates an electrostatic field. The electrostatic field creates an airflow of garbage into your work environment. I have no easy solutions. Some of these links may be be tenuous, but they are no more tenuous than the possibly erroneous correlations already drawn.