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.

According to : "The average level of cotinine (metabolized nicotine) among nonsmokers increased by 456% and the average levels of the carcinogen NNAL increased by 112% after four hours of exposure to secondhand smoke in a smoke-filled casino with a "sophisticated" ventilation system."

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