A report, commissioned for Public Health England, has heaped praise on the electronic devices saying they could be a "game changer in public health." That's in sharp contrast to Welsh public health officials who want them included in the smoking ban.
A leading cancer charity says the Welsh Government needs to "reconsider its position" on e-cigarettes. Tenovus Cancer Care says the devices are one of the most effective ways of helping people quit smoking.
It follows research by Public Health England that suggests the devices do not act as a 'gateway' to conventional cigarettes. The report says regular use is found "almost exclusively" among those who have already smoked and shows e-cigarettes are “around 95% less harmful” than conventional smoking.
Almost 2000 Welsh people die from lung cancer every year - and 1600 of those deaths will be due to smoking cigarettes, the charity says.
Research reveals e-cigarettes are "significantly less harmful" than cigarettes but the Welsh Government want them included in smoking bans.
ITV News takes a look at some of the issues surrounding the electronic smoking devices.
A report for NHS England say e-cigarettes could be a 'game changer' in public health but Welsh ministers still want a ban