It's not clear to me why researchers who oppose electronic cigarettes are so anxious to condemn these products that they are willing to use inappropriate research designs to fulfill such an aim.

Whether e-cigarette use precedes smoking or smoking precedes e-cigarette use is a critical question, but it is one which needs to be answered through longitudinal research. We need studies that follow the trajectory of teen tobacco/e-cigarette use over time. That is the only way to determine which comes first.

In an published today in the Wall Street Journal, I highlight the fact that many legislators and health organizations have demonized electronic cigarettes, largely on the basis of the erroneous conclusion that there is scientific evidence demonstrating that these products are a gateway to cigarette smoking among youth. The piece points out that there actually is no such scientific evidence and in fact, it presents evidence to the contrary.

The FDA is essentially saying that ex-smokers who have quit smoking using electronic cigarettes might as well revert back to smoking, since the Agency is not aware that vaping is any less hazardous than smoking. Is this the kind of scientific-based advice that we think is appropriate to be coming from a federal health agency?

Snowdon also noted that the UK National Smoking Cessation Conference was funded by GlaxoSmithKline and Pfizer. He wrote:

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