Are e-cigarettes really safe, and is the secondhand vapor bad for your health?

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Indoor exposure to vapor safer than smoke
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"E-cigarette use produces a visible vapor that is usually able to be smelled, depending on the flavors and other contents of the fluid. The vapor is discharged into the air only when the user exhales (i.e. there is no sidestream vapor), in contrast to tobacco cigarettes that discharge smoke continuously while kept alight, and when the user exhales."

Secondhand Smoke Goes Electronic With Damaging Free Radicals From E-Cig Vapor
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"When electronic cigarettes hit the U.S. market back in 2007, not all health care practitioners were quick to label them a safer alternative to traditional cigarettes with nicotine."

Second-hand e-cig smoke compared to regular cigarette smoke
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"Second-hand e-cig smoke has 10 times less particulate matter than regular cigarette smoke; but higher levels of certain toxic metals, a new study finds."
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