If you were going to smoke in your car with all the windows up that would just be gross. I always though those things were more of a home device. I don't know how well they clean the air. I have heard they can't circulate that much air. So I guess turn a fan on to blow air into it and over time it may help. I saw a small one at Wal-Mart the other day for like 20 bucks.
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