In other words, this is a special exemption put in place for what are clearly political, rather than public health purposes.

The study finds that e-cigarette use is associated with smoking status. In addition, e-cigarette use is associated with heavier smoking and with fewer periods of smoking abstinence.

(See: Grana RA, Popova L, Ling PM. A longitudinal analysis of electronic cigarettes use and smoking cessation. JAMA Internal Medicine. Published online March 24, 2014. doi:10.1001/jamainternmed.2014.187.)

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

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