Cigarette smoke houses are NOT a good buy! Even if you remove all of the carpets, paint every square inch of the interior of the home, professionally sanitize and duct blast the duct work, and run an Ozone machine for 48 hours, it’s still not guaranteed that you’ll get all of the smell out. It always entertains me when I inspect a flipped house that has all new carpet and paint, remodeled kitchen and bathrooms, yet still smells of cigarette smoke once you remove the 15 air fresheners they’ve plastered throughout in an attempt to cover it up.