The closets will be full of nicotine-infused clothes, and the rooms will be full of nicotine-infused people. 

You would get a nicotine buzz just standing in the house.

If there are unauthorized pets and unauthorized smoking, we can often see the evidence in the furnace filter as it traps pet hair and gets a tinge of yellow color from nicotine.

If you have smokers in there, use a regular Swizzle floor mop (I think that's what it's called-- the ones with the replaceable cleaning pad) to scrub the cabinets and walls-- takes most of the nicotine right off.  

Be careful trying to go down the tobacco route because some users use 0 nicotine products too.My guess is the guy with asthma is being triggered by something else.

Upon further inspection, the urine permeated the carpeting, paddingand wood flooring throughout the home.

When you pull the wax up, the stain has permeated the vinyl, not salvageable.

It can build a false sense of overconfidence and security that can permeate your foundation.

Lynn Harrison I am confused, are you concerned that water will permeate through the marble counter?

Backyard fully fenced with gate.A - 2/1, $425 - window AC, long-term renter (10+ years), smoker (nicotine staining)B - 2/1, $550 - central HVAC (1987 AC, 2020 furnace)C - 1/1, $395 - window ACBestPlaces says the local area has 5% unemployment, with positive job growth of 2+%.