I set-up my computer 'station' next to the sliding glass door leading out to my backyard. The door is to my right. On my left, at about 10 o'clock, I have one 12" turbo-fan aimed straight out that door. The airflow is about parallel with the wall my computer is up against. To my left at about 8 o'clock, is a small 16" tower fan, aimed mostly toward the face of my computer. I've fanangled it such that the vast majority of the smoke exits my mouth and is blown outside to my right, through the open door.
When I enter the room after being away for awhile, I'm not smelling anything lingering around. To be sure, the ozium or Febreeze are handy if I ever do. The downside is, the airflow is not powerful enough to defeat the flys that intrude, LOL. Thus, a little investment is fly-strips and fly-paper for the windows, which they invariably are attracted to in seeking exit.