"Among U.S. adults who were established smokers in the past five years, those who use e-cigarettes daily were significantly more likely to have quit cigarettes compared to those who have never tried e-cigarettes. Researchers at Columbia University's Mailman School of Public Health and the Rutgers School of Public Health found that over half of daily e-cigarette users had quit smoking in the past five years, compared to just 28 percent of adults who had never tried e-cigarettes. This is one of the first studies to reveal the patterns of cessation prevalence among e-cigarette users at a national level."
https://medicalxpress.com/news/2017-08-daily-e-cigarette-users-highest.html
https://medicalxpress.com/news/2017-08-daily-e-cigarette-users-highest.html