They found that while 95% of non-smokers and 85% of smokers agreed that direct inhalation of second-hand smoke was harmful to children, just 65% of non-smokers, and 43% of smokers believed the same for "third-hand" smoke.

BBC: Warning over 'third-hand smoke'

Previous reports recorded a "sharp decrease" in "non-smokers exposure to second-hand smoke" following the ban in smoking in public places in 2006.

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There are many non-nuclear ways of getting smoke up there that could be encouraged.

ECONOMIST: Letters

Smoking bans could have an effect on reducing heart attacks or heart disease generally by one of two major routes: either by inducing current smokers to quit or by reducing the exposure of non-smokers to environmental tobacco smoke (ETS).

FORBES: Do Smoking Bans Really Save Lives? If So, Whose?

Worldwide, as many as 40% of children, 33% of non-smoking men and 35% non-smoking women were exposed to second-hand smoke in 2004, researchers found.

BBC: Passive smoking 'kills 600,000' worldwide

The proposals mean all restaurants in England would be smoke-free, along with pubs and bars serving food, she added, and "non-food" pubs and bars will be free to choose whether to allow smoking, or be smoke-free.

BBC: NEWS | UK | UK Politics | Cabinet agrees England smoke ban

Around 40% of the Russian population smoke cigarettes, and non-smokers in the country have had enough of them.

FORBES: Russia Getting Tougher On Tobacco

Steven Burt, G24's chief financial officer, talks of light-bulb-powered TV remote controls, smoke detectors and computer keyboards. (A non-removable internal battery would store charge for use when the lights are off.) The company already offers prototypes of bags and jackets with photosensitive panels woven in, designed to charge digital cameras and mobile phones, and a hotel in Las Vegas is using G24's products to run its electric window-blinds.

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Just as cigarette smoke could waft into the non-smoking areas before it was banned, so too will noise, said George Hobica, founder of Airfarewatchdog.com, speaking to NBC news when AirAsia X's new option was announced last year.

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"The best way of addressing public concerns about environmental tobacco smoke is through the provision of designated non-smoking and smoking areas with good ventilation, " he said.

BBC: Image of a smoke filled room

"I come home from bars smelling like smoke, " says Feliz Lopez, a non-smoking 20-year-old college student visiting from New York.

CNN: China clouded in cigarette smoke

Secondhand smoke also causes lung cancer, heart and lung disease in non-smokers.

CNN: Is secondhand smoke really that risky?