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"This is the first time we found e-cigarettes to be less popular than FDA-approved pharmaceutical aids, such as medications or the use of patches, gum, or lozenges," said John P. Pierce, the director for population sciences at the Moores Cancer Center at the University of California, San Diego.
"E-cigarettes were also associated with less successful quitting during that time frame," said Pierce, a professor emeritus of family medicine and public health. In fact, nearly 60% of recent former smokers who were daily e-cigarette users had resumed smoking by 2019, the new study found.
"There's no evidence that the use of e-cigarettes is an effective cessation aid," Pierce said.