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It’s been a rough year for the vaping industry. What began as a purportedly less harmful replacement for combustible cigarettes has become the focus of investigations into everything from lung disorders to fatalities. And now a new study has found concentrations of dangerous heavy metals like lead and copper in vapors produced by some types of tank-style e-cigarettes. Tank-style e-cigs, as opposed to the thinner (aka “cig-a-like”) and disposable styles, generate aerosol vapors using large capacity vape-fluid tanks and powerful batteries.