I bought a house that had smokers. It smelt like a full ashtray. Bought a gallon of vinegar, poured a cup in a dozen shallow bowls, then left it for 24 hours. Next day smoke smell was gone, even in rooms with carpets. I’d do this and wash all bedding, add cup of vinegar to final rinse. You might want to rent a steam cleaner to do an extra clean of any upholstered items and carpets just to be Sure.
That quote is outrageous. Hire a cleaning service to steam clean carpets and upholstery. Walls should be ok as it’s only been a short time.
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