Will painting cover the smoke smell?

Not durably. Ordinary paint over untreated residue seals it for a few weeks and then the residue off-gasses through, so the smell returns and the coat has to be redone. Clean and treat first, then paint, and use a sealer only on material that could not be fully cleaned.

Do I need to replace the carpet?

Usually yes, or at least the pad. Carpet and pad absorb more smoke residue than anything else in a room and are almost always cheaper to remove than to treat to a standard you would be happy living with.

Why is it worse in summer?

Thirdhand smoke residue re releases faster as heat and humidity rise. The material on the walls has not changed, but warm humid air pulls far more of it back into the room, which is why a house can seem acceptable in February and unbearable in July.

Should I use an ozone machine?

We never do. Ozone requires the property to be empty, degrades rubber seals, plastics and adhesives, and the odor frequently returns once the building warms up. Hydroxyl generators with HEPA and activated carbon achieve the result without attacking the house.

How long before the house smells normal?

Most homes are treated in 1 to 4 hours and the difference is immediate, though a heavily smoked property with residue in the drywall and duct work sometimes needs a second visit. What matters more than time is sequence: cleaning the film off first is what makes everything after it work.

The Previous Owner Smoked in This House: How to Get It Out

A house that was smoked in for years does not smell of smoke because the air is stale. It smells because there is a physical layer of tar and nicotine on almost every surface in the building, including surfaces you cannot see, and that layer keeps giving off odor long after the last cigarette.

If you have just bought one, the good news is that this is a well understood problem with a reliable process. The bad news is that the two things most people try first, washing and painting, are the two that disappoint most reliably.

Part of our complete guide to odor removal and resale value, which covers every cause and what each one needs.

The short answer

Smoke leaves a sticky tar and nicotine film that bonds to walls, ceilings, trim, cabinet interiors and the whole ventilation system, then re releases whenever it is warm or humid. Washing reaches what a cloth can touch and painting seals residue in for a few weeks before it works through. Clearing it means cleaning the film off, treating what remains at the source, scrubbing the air and the ducts, and sealing only what cannot be cleaned.

The residue is a physical film, not a lingering smell in the air.
It concentrates above where someone sat and around every return air vent.
Painting over untreated residue is the classic wasted coat.
The HVAC has been distributing it through the whole house for years.

What is actually on your walls

Tobacco smoke is a mix of tar, nicotine and combustion byproducts that settles out as a sticky, oily film. Over years it builds on walls, ceilings, trim and the insides of cupboards. You usually cannot see it until you drag a clean damp cloth down a wall in a long term smoker's house and it comes back yellow brown.

Researchers call the leftover chemistry thirdhand smoke, and the important property is that it re releases into the air, faster as heat and humidity climb. That is why a smoker's house can seem tolerable in winter and become overwhelming in the first warm week of summer.

Two places concentrate it. Above wherever someone habitually sat, because smoke rises, and around every return air vent, because the ventilation system has been pulling smoke toward it for years.

Why washing and painting disappoint

Washing genuinely helps, and it is a necessary step, but it only reaches what a cloth can physically touch. It does not reach the inside of the duct work, the back of the cabinets, the carpet pad, or the porous face of unsealed drywall.

Painting is the more expensive disappointment. A coat of ordinary paint over untreated residue traps it for a few weeks, then the residue continues to off-gas through the new film and the smell returns, and now it is behind something you have paid for. Sealing does have a place in this work, but it is the last step and it goes on material that has already been cleaned.

Do not start with an air freshener

A fragrance on top of stale smoke produces a distinctive combination that everyone recognises, and if you ever sell or rent the property it is the first thing a visitor will notice. Neutral is the target, not pleasant.

The process that clears it

This is the order that works, and skipping a step is what causes the rebound most people experience.

Clean the film off. Degrease the walls, ceilings, trim and cabinet interiors. This is the step that removes the bulk of the material, and no machine substitutes for it.
Deal with what is saturated. Carpet, pad and sometimes curtains and blinds are cheaper to remove than to treat, and they hold more residue than anything else in the room.
Break down what is left. Enzymatic and oxidizing treatment on surfaces, and thermal fogging so the treatment follows the same routes the original smoke travelled, into cracks, behind trim and into porous surfaces.
Run hydroxyl generators. These treat airborne and deep surface odor and are safe to use with people in the building, which is why we use them instead of ozone.
Clean the HVAC. Change the filter and clean the ducts, or the system simply redistributes what is left through every room.
Seal what stays. Anything that cannot be fully cleaned, such as stained drywall you want to keep, gets sealed last so it cannot off-gas later.

We never use ozone and we never use chlorine. Ozone requires the building to be empty and degrades rubber and plastics, which is a poor trade in a house you have just bought. Everything we use is green and non toxic, and most homes are finished in 1 to 4 hours.

What to do first, this week

Before anyone quotes anything, do two things. Open the house up properly for a few hours a day, which costs nothing and tells you how much of the smell is airborne rather than in the material. Then change the HVAC filter, which is cheap and often produces a noticeable improvement on its own because the old one is saturated.

After that, resist decorating until the source work is done. Every new finish that goes on before treatment is a finish you will be redoing.