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 not only is CDC failing to disclose the important conflicts of interest of the 2014 Surgeon General's report authors, but OSH is involved in a cover-up. Apparently, OSH has deliberately chosen to hide these conflicts of interest from the public.

a. Classic tobacco

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