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Nevertheless, this does not stop the authors from drawing a conclusion. They conclude, despite their acknowledged inability to draw such a conclusion, that: "e-cigarette use is aggravating rather than ameliorating the tobacco epidemic among youths."

The recent increase in the popularity and availability of e-cigarettes has seen a significant growth in advertising for them. While e-cigarettes have always been allowed to be advertised and have been subject to general rules covering misleading claims, harm, offence and social responsibility, they have not, until now, been subject to product specific rules.

The problem is that in this cross-sectional study, there is no way to determine the direction of the observed relationship.

A scientist who is currently with the UCSF Center for Tobacco Control Research and Education (home of Dr. Stan Glantz) is part of a research team that conducted an on hundreds of thousands of Facebook users, whose Facebook news feed content was without their informed consent in order to try to trigger their emotions.

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