The authors of this study make one of the most cardinal errors in all of epidemiology. They ignore the principle that "correlation does not equal causation."

The European Respiratory Society, then, is opposed to the use of e-cigarettes at the present time in the United States. What this means is that the ERS would rather see smokers continue to use tobacco cigarettes than quit smoking by switching to electronic cigarettes.

You can see the quality of the scientific reasoning we are dealing with.

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