Recently moved to CA, and when we moved into our rental, there was a very strong smell of marijuana around the house :(. On top of that, we have 5 big dogs. After a good cleaning, some plugins and this Air Purifier, our place now smells really fresh and clean. You would never know that the previous tenants used to smoke, and the place doesn't smell like dogs. (Although, they are indoor dogs, and I keep them very clean). It's also pretty  quiet on the medium-low settings. Overall great buy! Highly recommend.