If we accept that authors' word - that there is no way from this study to exclude the possibility that youths are initiating smoking with conventional cigarettes and then moving on to e-cigarettes - then it follows that these authors are being dishonest in telling the public that the study shows that:

The researchers reported that patients who used e-cigarettes were no more likely to have quit smoking at follow-up than patients who did not use e-cigarettes.

Instead, these advocates argued that surveys are the best way to study the potential benefits of e-cigarettes. Surveys measure the real-life situation of how e-cigarettes and vapor products are actually used.

Facebook’s actual contains none of these, only general statements that “we may use the information we receive about you … for internal operations, including troubleshooting, data analysis, testing, research and service improvement.” and “We give your information to the people and companies that help us provide, understand and improve the services we offer. For example, we may use outside vendors to … conduct and publish research.” Neither of these comes close to a “description of the procedures to be followed” or a “description of any reasonably foreseeable risks or discomforts,” and the Data Use Policy doesn’t even attempt to offer a contact for questions or an opt-out."

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