I got this little air purifier for an upcoming visit to my parents house, they are both heavy smokers- it never bothered me until I moved out and quit smoking myself, but now the smell drives me absolutely crazy. To be fair they smoke less when the grandkids visit but the smell does linger. I figure if I run this in the bedroom where my daughters and I will stay we'll get some relief at night and nap times. I'll update my review after our trip. But wanted to set the stage for why I bought it and what I expect. I LOVE that I can add essential oil to help with the smell.