And Dr. Terry failed to stop the study in 1965, even after the 1964 World Health Organization's Helsinki Declaration clearly articulated the ethical imperative of informed consent for human medical experimentation.

A recent from the UK involved a survey of 12,171 adults in February and March of this year. The survey found that 4.7% of ex-smokers were regularly using electronic cigarettes. Among these ex-smokers, 71% reported that they were using e-cigarettes to try to quit smoking and 48% reported that they were using e-cigarettes to try to keep off tobacco products. These data suggest that the overwhelming majority of ex-smokers using e-cigarettes are people who smoked and then quit smoking because of these products, rather than ex-smokers who returned to nicotine use via e-cigarettes.

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