for people who hate smoke.

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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 is not as easy to get rid of: third-hand smoke.

That is 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 are 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.

'Everyone knows that second- hand smoke is bad, but they don't know about this,' said
Dr Jonathan P. Winickoff, the lead author of the study and an assistant professor of paediatrics at Harvard Medical School.

'When their kids are out of the house, they might smoke. Or they smoke in the car.
'Or they strap the kid in the car seat in the back and crack the window and smoke, and they think it's okay because the second-hand smoke isn't getting to their kids,' he said. 'We needed a term to describe these tobacco toxins that aren't visible.'

Third-hand smoke is what one smells when a smoker gets in an elevator after going outside for a cigarette, he said, or in a hotel room where people were smoking.

'Your nose isn't lying,' he said. 'The stuff is so toxic that your brain is telling you, 'Get away'.'
Dr Philip Landrigan, a paediatrician who heads the Children's Environmental Health Center at Mount Sinai School of Medicine in New York, said the phrase third-hand smoke is a brand-new term that has implications for behaviour.

'The central message here is that simply closing the kitchen door to take a smoke is not protecting the kids from the effects of that smoke,' he said. 'There are carcinogens in this third-hand smoke and they are a cancer risk for anybody of any age who comes into contact with them.'

Among the substances in third-hand smoke are hydrogen cyanide, used in chemical weapons; butane, which is used in lighter fluid; toluene, found in paint thinners; arsenic; lead; carbon monoxide; and even polonium-210, the highly radioactive carcinogen that was used to murder former Russian spy Alexander V. Litvinenko in 2006. Eleven of the compounds are highly carcinogenic.

The New York Times. featured in 2days mind your body