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 required text for the corrective statements and their required placement is as follows:

Like I mentioned, Cigavette has the market when it comes to an e-cigarette that tastes like tobacco. The box even smelled like a regular pack of smokes. I was almost certain that they had squeezed tobacco juice right out of some moist tobacco and stuck it in their cartridges.

(See: Zhu S-H, et al. Four hundred sixty brands of e-cigarettes and counting: implications for product regulation. Tobacco Control. Published online ahead of print on June 17, 2014.)

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