I never smoke cigars in my vehicles. Makes them stink. Only ever (and very occasionally) smoke a pipe in the car and that with the driver's window and passenger rear window rolled down at least an inch apiece. Makes for a nice cross-breeze in my vehicle that whisks the smoke right out. It's not effective with a cigar but with a pipe you can't even tell you smoked it the next day - unless you leave the smoked pipe in the car that is.