https://www.google.com/amp/s/mashable.com/2018/02/23/e-cigarettes-toxic-metals-lead-arsenic.amp “The study's authors tested three elements of the e-cigs: the liquid itself, the liquid inside of the vape pen's chamber, and the aerosol (or vapor). They were specifically interested in whether the metal coil that vape pens use to heat the liquid in order to turn it into vapor was leeching or generating toxic metals. And it turns out, their hypothesis was right. There was not a significant amount of toxic metals in the e-cig liquid itself. But in over half of the e-cigs, the liquid inside the dispenser and the aerosol contained significant levels of chromium, nickel, and lead. According to the study's authors, chromium and nickel have been linked to respiratory disease and lung cancer. And lead can cause neurotoxicity and cardiovascular disease — there is also no safe amount of lead exposure. ‘It’s important for the FDA, the e-cigarette companies and vapers themselves to know that these heating coils, as currently made, seem to be leaking toxic metals—which then get into the aerosols that vapers inhale,’ study senior author Ana María Rule, PhD, MHS, an assistant scientist in the Bloomberg School’s Department of Environmental Health and Engineering, said in a statement.“ It’s got me a little worried. It’s the coil itself rather than the liquid that is the problem. As I said before, I’m not familiar enough with the design of e-cigs and the Enano to know what to think.