How to Get Smoke or Cannabis Smell Out of an Apartment
Smoke smell in an apartment is caused by thirdhand smoke — the residue that deposits on every surface in the space: walls, ceilings, fabrics, carpets, and HVAC components. The smell returns unless every surface that has absorbed the residue is cleaned, since it continues to off-gas from surfaces even after the smoking stops. This is relevant both for tenants moving into a unit previously used by smokers and for current residents trying to manage or eliminate odours.
Step 1: Ventilate
- Open all windows and run fans to maximize air exchange
- Run the bathroom and kitchen exhaust fans continuously for the first few days
- Place activated charcoal bags or open boxes of baking soda in rooms — these absorb airborne odour molecules
Step 2: Clean Hard Surfaces (Walls, Ceilings, Baseboards)
Smoke residue deposits on all hard surfaces as a thin, sticky film that absorbs odour molecules:
- Wipe all walls and ceilings with a solution of 1/4 cup TSP (trisodium phosphate) or TSP substitute in a gallon of warm water — TSP is a heavy-duty degreaser that cuts through smoke residue effectively
- Alternatively: a solution of 1 cup white vinegar in 1 gallon water
- Work systematically in sections: ceiling first, then top to bottom on walls
- Rinse with clean water and allow to dry
- After cleaning, apply a primer with odour-blocking properties (Kilz Original, BIN Shellac-Based Primer) to walls before repainting — this seals in any residual odour that cleaning didn't fully remove
Step 3: Clean Fabrics and Soft Surfaces
- Wash all washable fabrics — curtains, bedding, throw covers — in hot water with a cup of white vinegar added to the wash
- Upholstery: sprinkle baking soda on all upholstered surfaces, allow 24 hours, vacuum thoroughly. Repeat.
- Carpet: rent a carpet cleaner or book a professional carpet clean — machine cleaning removes significantly more embedded smoke residue than surface cleaning
Step 4: HVAC and Air Quality
- Replace HVAC filters — smoke residue deposits in filters and the filter itself becomes an odour source
- If possible, have the ductwork cleaned — smoke residue can accumulate in ducts and re-enter the air continuously
- Run an air purifier with an activated carbon filter — carbon filters capture volatile organic compounds (VOCs) from smoke, while HEPA filters capture particles
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