Many renters already know and the Centers for Disease Control has confirmed that secondhand smoke can seep through air ducts, cracks in flooring and walks, stairwells, hallways, elevator shafts, plumbing, electrical lines and open windows.

Although a smoke-free policy in multi-unit housing is not required by law, many renters are demanding smoke-free living spaces and landlords are responding to the market for smoke-free clean, healthy homes.