third-hand smoke
n. Particles that linger on surfaces after second-hand tobacco smoke has dissipated.
Researchers have found that third-hand smoke containing heavy metals, carcinogens and even radioactive materials lingers long after second-hand smoke has dissipated, and can be ingested by children crawling around a room.

Winickoff says parents who try to protect their children from second-hand smoke by rolling down a window of the car or smoking only when the children are out of the room are not doing enough.

If the smell of the cigarette lingers, he said, so does the danger.

"You're nose isn't lying. If your body detects it, then it's there," he says.

"And children are more susceptible than adults."

Third-hand smoke has been found to contain hydrogen cyanide, used in chemical weapons; butane; toluene, found in paint thinners; arsenic; lead; carbon monoxide; and polonium-210, the highly radioactive carcinogen that was used to murder former Russian spy Alexander V. Litvinenko in 2006.
—Stuart Laidlaw, “Toxins from 'third-hand smoke' linger on,” The Toronto Star, January 06, 2009
Parents who smoke often open a window or turn on a fan to clear the air of second-hand smoke, but experts now have identified another smoking-related threat to children's health that isn't as easy to get rid of: third-hand smoke.

That's the term being used to describe 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.

Doctors from MassGeneral Hospital for Children in Boston coined the term ''third-hand smoke'' to describe these chemicals in a new study that focused on the risks they pose to infants and children. The study was published in this month's issue of the journal Pediatrics.
—Roni Caryn Rabin, “A New Cigarette Hazard: 'Third-Hand Smoke',” The New York Times, January 03, 2009
1991 (earliest)
''I never heard of third -hand smoke,'' I said. ''What's that?''
''You can be victimized by third-hand smoke from being around people who smoke, even if they're not smoking, or who claim to be giving up smoking,'' she explained. ''When such people speak or even breathe, they exhale dangerous toxins that, if inhaled, may be harmful and/or distasteful.
—Gerald Nachman, “When There's Smoking There's Ire,” The San Francisco Chronicle, April 19, 1991
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