In fact, in a by Flouris et al., the investigators found that real cigarettes, but not the fake ones, had a significant detrimental effect on pulmonary function, measured by spirometry. This study documents that while active smoking has immediate, clinically meaningful effects in reducing lung function, electronic cigarettes do not.

Can you imagine if the tobacco companies used the same logic as Dr. Glantz? They would, according to his scientific reasoning, be perfectly honest in communicating to the public statements like this:

This is particularly disturbing, as five years have passed and numerous studies have been published since the FDA originally told the public that cigarette smoking may be than using non-tobacco, non-combusted electronic cigarettes.

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."

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