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Ozone generators do a good job of nullifying smoke smell once you're finished. They should not be used while you're smoking. Close up the room and turn it on when you're done. Next morning it'll smell like fresh rain.

Many people are not looking for that though. They want something that will thin out a smoky room while people are smoking. That's where you'd want a smoke eater. However, they are pricey. You'd likely be better off finding a way to exchange air into/out of the room.