If the room has a lot of cloth for the smoke to stick to, just spray it all down with Febreeze right afterwards. I've done this a couple times after smoking out the window (too lazy to go outside) to get rid of the smell from the smoke that blew back inside. Dunno how well it'd work for actually smoking inside, though.

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In this kind of town, say you kick someone in the head. They'll just, well, they'll likely sue you... but mad? No, they don't get mad.

~ Gogol Bordello "Punk Rock Parranda"