third-hand smoke

Turns out opening a window to air out second-hand smoke doesn't quite cut it. Third-hand smoke is especially harmful to infants and children, and includes:

"the invisible yet toxic brew of gases and particles clinging to smokers’ hair and clothing, not to mention cushions and carpeting, that lingers long after smoke has cleared from a room. The residue includes heavy metals, carcinogens and even radioactive materials that young children can get on their hands and ingest, especially if they’re crawling or playing on the floor."

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