"There's a lot we don't know about them."

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

E. Announced regulations on electronic cigarettes that carve out a special regulatory category for these products that encourages e-cigarette use over tobacco cigarette use.

The CDC is even worse. It actually acknowledges the existence of these former smokers, but still argues that there is no evidence that electronic cigarettes have helped any smokers quit.

The Rest of the Story

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