[Nelson]

I have one also. It does require that you put up your windows and let it run for several minutes with the AC cranking. I smoke in my car occasionaly and this unit is constantly on, wether i smoke or not. It does help with the odor, but what i found to be the most effective is to bring down all windows and let the air flow, if on the freeway, i crack my sunroof a bit and it acts as a huge vacuum sucking out all the smoke(pretty cool to watch too). Ventilation is the name of the game.