Dr. Ken Warner, a nationally recognized tobacco control expert, doesn't buy it. He was quoted as :

We have today published new advertising rules for e-cigarettes to ensure they continue to be promoted in a responsible way. The new rules add to those already in place and will come into effect on 10 November 2014.

The authors admit this in the paper. They write: "This is a cross-sectional study, which only allows us to identify associations, not causal relationships."

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