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[...] Now scientists say they have measured levels of such “thirdhand” smoke, suggesting it is carried on the bodies and clothing of moviegoers and could be a prominent, and lingering, source of hazardous chemicals.

“This represents significant but poorly understood health risks to non-smokers and a source of reactive chemicals indoors,” said Dr Drew Gentner, co-author of the research from Yale University, noting that previous studies suggest thirdhand smoke may account for between 5% and 60% of the combined disease burden from cigarette smoke in non-smokers.