FILE - In this April 23, 2014 file photo, E-cigarettes appear on display at Vape store in Chicago. Smokers who used e-cigarettes were more likely to kick the habit than those who didn’t, according to a new study that suggests a liberal approach to the electronic devices could help curb smoking rates. The American study was based on the biggest sample of e-cigarette users to date and attempted to clarify if e-cigarettes help smokers quit. The research was published online Wednesday, July 26, 2017 in the journal, BMJ. (AP Photo/Nam Y. Huh, File)