Contrary to the assertion of the authors of this paper, simply being aware that the information one provides to Facebook may be used for research purposes does not constitute informed consent. The fact that users agreed to a Data Use Policy which notes that information may be used for research purposes does not, as the authors state, "[constitute] informed consent for this research."

Keep in mind pure caffeine is very very bitter. I once tried caffeine infused water before, and it was quite nasty, so having a very high concentration of caffeine would definitely ruin the flavor. So since the bottle of E-Juice I tried didn’t have any bitter notes, I’d say a low concentration was used.

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