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I don't smoke but occasionally I let my friends smoke. I open up all the windows and sunroof then turn off the AC. The only rule is keep the cigarette outside the windows at all times and stick your head out the window when puffing and exhaling. Yes, they have lost many cigarettes and one time the whole cig went into his mouth. The humor level is acceptable for me to allow smoking in my car
I usually crack the sunroof halfway and ash from the top while driving.... Or if I'm at a stop, I'll crack the window about 1/4 of the way and ash from the driver's side.