1. "This is a cross-sectional study, which only allows us to identify associations, not causal relationships."

A further reason not to ban flavorings in e-cigarettes is that youth who experiment with these flavored products are almost certainly much less likely to progress to smoking. It is difficult to imagine a youth transitioning from a cherry e-cigarette to a Marlboro. In a sense, flavored e-cigarettes may actually be protective of youth transitioning from vaping to smoking. The tastes are so vastly different, and the e-cigarette use probably accustoms youth to a flavored taste that they are just not going to get with a real cigarette.

Further, the FDA is asking smokers who suffer such extra-ordinary health effects to report them to the agency. But the FDA doesn't want to hear from you if you simply suffer a "normal" health effect, like crippling obstructive lung disease, inability to breathe, metastatic cancer, or brain infarctions. In order to engage the FDA's interest, the health problem must be one that is beyond these "normal" product side effects.

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