If you’re preparing a home for sale, renovating a recently purchased property, or trying to get rid of years of cigarette smoke odour, painting the walls may seem like the easiest fix. But if the house still smells like smoke after painting, there’s a reason: paint changes the appearance of a surface, but it does not eliminate the source of a persistent smoke odour.
Cigarette smoke travels beyond the visible walls and settles into porous materials throughout a home — carpets, upholstery, drywall, ceilings and more. That’s why, in homes with a significant smoking history, smoke odour removal should come before painting, not after it.
Why Does Cigarette Smoke Smell Stay in a House?
Cigarette smoke is more than a smell floating in the air. Years of smoking can leave behind a stubborn film of nicotine, tar and other smoke-related compounds on walls, ceilings, trim, doors and other surfaces — residues that keep contributing to odour long after the smoking has stopped.
This is why opening windows, using air fresheners or applying a fresh coat of paint often provides only temporary relief. The odour may seem to disappear at first, only to return once the home becomes warm, humid or enclosed.
Where Can Smoke Odour Hide?
Persistent cigarette smoke odour can be found throughout a home, including:
- Walls, ceilings and drywall
- Carpets and carpet padding
- Curtains, upholstery and mattresses
- Cabinets and closets
- HVAC systems and air-handling areas
The longer a property has been exposed to tobacco smoke, the more important it becomes to address the odour at its source rather than just its surfaces.
Why Painting Over Smoke Smell Doesn’t Solve the Problem
A common mistake is assuming a new coat of paint will seal away cigarette smoke odour permanently. Painting can be part of a restoration or renovation, but it isn’t a deodorization step — if smoke-contaminated materials haven’t been properly cleaned and treated, odour can remain in places paint never reaches. You can cover a surface without treating what’s actually causing the smell.
That’s why professional smoke odour remediation focuses on cleaning and treating affected areas before cosmetic work like painting begins. For severe contamination, treating the air alone isn’t enough either — the materials holding the odour need to be part of the treatment plan too.
Clean and Treat Smoke Odour Before You Paint
The first step with a smoke-affected home is identifying where the odour has travelled and what materials are holding it. Depending on severity, this usually means thorough cleaning followed by an appropriate deodorization treatment.
At Fresh Start® Environments, chlorine dioxide technology addresses odours rather than masking them with fragrance. Our DeOdorPro products are built specifically for smoke-related odours — cigarette, fire and otherwise — and the same chlorine dioxide applications we use for smoke can also address odours from mould, mildew and other organic sources as part of our residential odour removal services.
How Chlorine Dioxide Helps With Smoke Odour
Unlike an air freshener, professional deodorization isn’t about adding another smell to the room — the goal is to neutralize the compounds responsible for the odour.
Chlorine dioxide is an extremely powerful oxidizer. At the molecular level, it pulls electrons from odour-causing molecules, breaking them down and effectively killing the microbes responsible for the smell. Because the molecule itself is destroyed, the odour can’t simply come back the way it can after masking or surface cleaning alone.
Our gas-release systems are designed for temporarily unoccupied, confined spaces where smoke odour is hard to reach through surface cleaning — and for liquid applications, our chlorine dioxide-based products treat the surfaces and porous materials where odour gets trapped in the first place.
Should You Paint a Smoke-Damaged Home?
Yes — but painting should come after proper cleaning and deodorization, not as the primary fix. The right approach depends on the extent of the contamination:
- Assess the property to determine the extent of smoke contamination.
- Clean affected surfaces and remove smoke residue where appropriate.
- Treat persistent odours with an appropriate deodorization process.
- Ventilate and reassess the treated areas.
- Repair, prime and paint once the odour problem has been addressed.
This sequence keeps cosmetic renovation from being used to hide an underlying odour problem. See our chlorine dioxide services page for a closer look at how the process works.
What If the House Has Already Been Painted?
You may still be able to address the odour. Painting doesn’t rule out remediation, but the treatment strategy may need to account for previously painted surfaces and any other areas where smoke odour remains. A professional assessment can pinpoint the source and the right approach. Either way, don’t keep adding layers of paint when the real problem is persistent smoke odour — treat the odour first.
Does Chlorine Dioxide Remove Cigarette Smoke Smell Permanently?
Chlorine dioxide can be a highly effective part of a professional smoke-odour treatment, but results depend on the severity of contamination, the materials affected, the treatment process used, and whether the original source has actually been addressed. Fresh Start® Environments uses chlorine dioxide for smoke-related odour problems in residential properties as well as fire and restoration applications. For heavily affected properties, a professional assessment is the best way to determine what needs cleaning, treatment or replacement.
The Fresh Start® Approach
Clean. Treat. Deodorize. Then paint.
Fresh Start® Environments specializes in chlorine dioxide-based odour removal and decontamination for residential and other environments, serving customers across Canada from our Milton, Ontario base. Whether you’re preparing a home for sale, moving into a previously occupied property, renovating after years of smoking, or dealing with stubborn odour that won’t go away, the right treatment makes a real difference.
Contact Fresh Start® Environments to discuss your smoke odour removal needs and find out which chlorine dioxide solution is right for your property.
Fresh Start® Environments Milton, Ontario, Canada Phone: 905-875-8722
Frequently Asked Questions About Smoke Odour Removal
Can you paint over cigarette smoke smell? You can paint over yellowed, smoke-stained walls, but painting alone won’t eliminate a persistent cigarette smoke odour. Smoke residue can remain trapped in porous materials throughout the property, so proper cleaning and deodorization should happen before you rely on paint to solve the problem.
What is the best way to remove cigarette smoke smell from a house? The best way is to physically remove it from every surface using an oxidizer designed for this purpose. Chlorine dioxide’s job is to pull electrons from odour-causing molecules, breaking them down at a molecular level. Because the molecule itself is destroyed, the smell can’t simply come back the way it can after masking or surface cleaning alone.
Does chlorine dioxide remove cigarette smoke odour? Yes — absolutely. Chlorine dioxide is used for all types of smoke odour treatment because of its oxidizing properties. Fresh Start® Environments offers chlorine dioxide-based liquid and gas solutions specifically for smoke-related odours, often using a primer-and-paint approach: treating surfaces with liquid chlorine dioxide first, then following up with a gas treatment. Using the same powerful molecule for both steps is what makes this approach so effective.
Will cigarette smoke smell come back after painting? It depends on the method used. Relying on an odour-blocking primer alone is a gamble — in a humid bathroom, for example, nicotine can bleed back through the wall after a hot shower, and once that happens the residue is no longer accessible for treatment, so the smell and staining can become permanent. In other rooms, a primer may not be enough on its own; the air needs to be treated as well, not just the surfaces.
Can cigarette smoke odour be removed from walls? Absolutely. Chlorine dioxide is a very powerful oxidizer that penetrates the cell walls of the microbes responsible for the smell. Depending on the severity, washing the walls with LiquaSan (liquid chlorine dioxide) may be enough, but in more severe cases a follow-up gas treatment is needed to fully address the contamination.
Should I use air freshener to get rid of cigarette smoke smell? Air fresheners generally mask or alter the perceived smell rather than addressing the underlying source. For persistent smoke odour, source-focused cleaning and deodorization are a better approach.
How long does cigarette smoke odour removal take? Usually 12 to 48 hours. Treatment time can vary depending on the size of the property, the severity of the contamination, the materials affected and the treatment method used — a professional assessment can provide a more accurate estimate.
The Bottom Line
If a home smells like cigarettes, don’t just paint over it — covering the smell without treating the source can create an additional problem down the road. If the existing paint is still in good shape, simply removing the nicotine and tar from the walls and treating the air may be all that’s needed, with no repainting required.
Painting may improve the appearance of a home, but it doesn’t automatically address the source of the odour. For a more complete solution: clean and deodorize first, then paint. With professional chlorine dioxide-based odour treatment, Fresh Start® Environments can help tackle stubborn smoke odours at their source rather than simply covering them up.