Inside the house or a heavy smoker. Everything was covered in nicotine at this house we did today. There was only so much cleaning could do, a full paint as well as replacing blinds is the only thing Millions of people are exposed to secondhand smoke every day. People living in multi unit housing are some of the most exposed. The only way to fully protect people from secondhand smoke at How to Clean Years of Cigarette Residue from Walls Does Vape Smoke Stain Walls with Continuous Indoor Use?