Heavy indoor smoking rarely knocks down the appraised value directly, but it shrinks the pool of willing buyers, and fewer buyers means fewer offers and a lower price. Smell and residue read as a project to most people, even when the fix is straightforward. We have seen properties where years of indoor smoking meant real remediation, sometimes replacing drywall and cabinets rather than just cleaning and repainting. Homes with serious pet urine damage sell the same way: the problem can absolutely be resolved, but it spooks buyers, and it usually takes a price discount to compensate them for the work and the uncertainty about whether the odor fully goes away. Which side of the deal you are on changes the takeaway: - Buying one? That discount can be your opportunity. You may face less competition, and you can price the remediation into your offer. - Selling one? Address the problem before listing, or price it in honestly. Buyers will notice, and the ones who stay will factor the work into what they offer.