E-cigarettes should be available on prescription, according to Public Health England (PHE).
The agency wants them to be prescribed on the NHS within the next few years because of how successful they have been in helping people give up smoking.
An independent review of the latest evidence, published by PHE, suggests at least 20,000 people a year are quitting with the help of e-cigarettes.
The report also says they are at least 95% less harmful than smoking.
PHE also wants hospitals to be able to sell e-cigarettes and have areas where patients can vape.
This could even be in private rooms for patients on long hospital stays, it says.
PHE also encouraged employers to provide vaping areas.