One of our neighbors was a smoker who lived in her house for 40 years. She swore she never smoked inside (sure Jan). She had a terrible time selling her home because of the intense, embedded smoke smell. The people who ended up buying it, had a company come out & fill it with ozone. Apparently, the ozone kills everything (bugs, mold, bacteria, etc...), and it worked on the smoke smell. We turned away from many a smoker's house when house hunting. It's nice to know there's a solution for the stench.