Rules around e-cigarettes should be relaxed so they can be more widely used and accepted in society, says a report by a committee of MPs.
Vaping is much less harmful than normal cigarettes and e-cigarettes should be made available on prescription to help more people quit smoking, it said.
The report also calls on the government to consider their use in public places.
There is no evidence e-cigarettes are a gateway into smoking for young people, Public Health England said.
The report on e-cigarettes, by the science and technology MPs' committee, said they were too often overlooked by the NHS as a tool to help people stop smoking.
For example, it said it was "unacceptable" that a third of the 50 NHS mental health trusts in England had a ban on e-cigarettes on their premises, when there was a "negligible health risk" from second hand e-cigarette vapour.
What else do the MPs say?
- In the report they call for:
- greater freedom for industry to advertise e-cigarettes
- relaxing of regulations and tax duties on e-cigarettes to reflect their relative health benefits
- an annual review of the health effects of e-cigarettes, as well as heat-not-burn products
- a debate on vaping in public spaces
- e-cigarettes licensed as medical devices
- a rethink on limits on refill strengths and tank sizes
- an end to the ban on snus - an oral tobacco product which is illegal in the UK under EU rules
How popular has vaping become?