I then explain that the gateway hypothesis is actually unsupported by any scientific evidence and that there is some evidence which is inconsistent with the hypothesis.

Regarding the engagement of Facebook users in research, Facebook's states the following:

The CDC's statement is wrong on its face. If there is reputable evidence from former smokers that e-cigarettes helped them quit smoking, then there is indeed conclusive scientific evidence that e-cigarettes "can work" as a cessation aid.

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