A issued by UC Riverside states unequivocally that this research finds thirdhand smoke to be every bit as harmful as active smoking.

According to a new published in the International Journal of Environmental Research and Public Health, asthmatic smokers who use electronic cigarettes experience an improvement in their asthma symptoms and lung function, even if they remain dual users.

The study analyzed the levels of a large number of pollutants in the ambient air of a room in an office building during the presence of three smokers using electronic cigarettes. The room was moderately ventilated at 0.56 air changes per hour.

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