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E-Cigarettes Secondhand Smoke Contains Toxic Metals, Researchers Say

(Undated) -- E-cigarettes are somewhat safer for smokers, but still release some dangerous toxins into the air. Researchers at the University of Southern California report that secondhand smoke from e-cigarettes contains high levels of harmful metals. The researchers say the metal particles in e-cigarette smoke probably come from the cartridges in the devices. Findings of the study are published in the "Journal of Environmental Science, Processes and Impacts."