(2) A description of any reasonably foreseeable risks or discomforts to the subject; …

The study concludes that the tobacco companies circumvented the law and argues that these brands should be labeled by the FDA as "adulterated" and pulled from the market.

Here, they find a correlation between e-cigarette use and higher and more sustained levels of smoking. But because this is a cross-sectional study, they cannot determine which came first. In other words, what is the direction of the causal relationship? Does the e-cigarette use precede, and cause, the smoking? Or does the smoking precede, and cause, the e-cigarette use?

The rest of the story is that new data from the CDC itself show that the smoking rate among U.S. high school students dropped significantly in 2013, reaching the (the Youth Risk Behavior Survey), which began in 1991.

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