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Reports show that many of these e-cigarette batteries have a poor design and are constructed out of low-quality materials

Additionally, the practice of super-heating the liquid by dripping and dabbing it onto a torch-flamed spike (nail) using specific devices designed for inhalation of the concentrated vapors produced by the procedure may also lead to production of toxic new agents [27]

Csmonitor.com

While its said that vaping is safer than smoking a cigarette, the truth is that we do not yet have enough long-term scientific studies that show that vaping is significantly safer

I would imagine under normal usage/care it should last for years

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