Do It Yourself

So my roommate is a habitual cigarette smoker. He doesn't smoke indoors (thankfully) but he does smoke about every other night outdoors. I don't think he realizes that when he's done smoking the smell sort of... lingers on him and his clothes. Last night after he was done he was in the kitchen for a bit cooking. I came in this morning to make a sandwich and the smell was all over the kitchen and very pungent, it made me think some food was rotting. This kind of thing happens probably once a week, and while I'm kind of used to it by now I do want to have people over and have them actually be comfortable.

Apart from asking him to quit (I doubt it) is there any sort of concotion or thing I can make / spray / sanitize to get rid of the smell? Some days it's nonexistent but other days it's almost unbearable.