In their to this response, the authors of the study clarify their reasoning for attacking the cigarette companies, even though they merely complied with the law:

In summary, this study helps to alleviate concerns raised by prior research and does not raise any new concerns. While more research is clearly needed, especially because there are so many different brands of electronic cigarettes on the market, the current evidence does not point to any substantial health hazards associated with passive vaping.

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