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Hey, I just learned something new today

In case of smoke-induced cell death in human lung microvascular endothelial cells exposed to phosphate-buffered saline-conditioned cigarette smoke mimicking the exhaled cigarette smoke, the level of exposure was assessed by the increase in nicotine/cotinine levels, thus assessed cell injury and cell death was discussed in relation to the increase in nicotine/cotinine levels [14]

Now when I found this out, I had a really distant bell in my head

compliance statement, product identification label, FCC logo) 10 CFR Part 430 Energy Conservation Program for Consumer Products 10 CFR Part 430 establishes performance requirements and standards for electrical consumer products and components, such as external power supplies, which you can be sold together with e-cigarettes