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

Regardless, the AHA considers e-cigarettes that do “contain nicotine to be tobacco products and therefore supports their regulation under existing laws relating to the use and marketing of tobacco products.” They suggest regulation in the areas of youth marketing, smoke-free air laws, and manufacturing, in order to make sure e-cigarettes don’t encourage nicotine use, which no matter what the delivery method, does present health dangers to its users.

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