The problem is that the smokers who used e-cigarettes were likely more heavily addicted and more resistant to quitting. The reason they tried e-cigarettes was probably related to their failure to quit smoking using other types of therapy, such as NRT or other drugs. E-cigarettes, after all, are not generally the first smoking cessation approach that a smoker will try.

(See: Borderud SP, Li Y, Burkhalter JE, Sheffer CE, Ostroff JS. Electronic cigarette use among cancer patients: Characteristics of e-cigarette users and their smoking cessation outcomes. Cancer. Published online ahead of print on September 22, 2014. doi: 10.1002/cncr.28810.)

What is the new "evidence" that e-cigarettes are a gateway to smoking? According to the letter sent by these politicians to the FDA: "What’s even more troubling is that these products serve as a gateway to traditional tobacco products. A recent JAMA Pediatrics study found that middle and high-school students who used e-cigarettes were more likely to smoke traditional cigarettes and less likely to quit smoking."

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