Levels depend on type and age of device, and they increase as it heats up
From: http://redirect.viglink.com?u=http%3A%2F%2Fwww.webmd.com%2Fsmoking-cessation%2Fnews%2F20160727%2Fe-cigarettes-emit-toxic-vapors-study%3Fsrc%3DRSS_PUBLIC&key=ddaed8f51db7bb1330a6f6de768a69b8
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