Electronic cigarettes will be licensed as a medicine in the UK from 2016, under new regulations.
The UK currently has few restrictions on the use of e-cigarettes, despite moves in some countries to ban them.
The Medicines and Healthcare Products Regulatory Agency says it will regulate e-cigarettes as medicines when new European tobacco laws come into force.
Sales of tobacco-free cigarettes have boomed worldwide since bans on smoking in public places were introduced.
Campaigners say the growing popularity of e-cigarettes could undermine years of anti-smoking efforts.
In some countries, such as New Zealand, e-cigarettes are regulated as medicines and can be purchased only in pharmacies.
In other countries, including Denmark, Canada and Australia, they are subject to restrictions on sale, import and marketing. Complete bans are in place in Brazil, Norway and Singapore.
E-cigarettes are designed to replicate smoking behaviour without the use of tobacco. They turn nicotine and other chemicals into a vapour that is inhaled.
But there have been growing concerns about the safety and quality of e-cigarettes.
Jeremy Mean of the The Medicines and Healthcare Products Regulatory Agency (MHRA) said the government had concluded that e-cigarettes currently on the market do not meet appropriate standards of safety, quality and efficacy.
Not recommended
He said there would be no compulsory licensing of the products until 2016 but until then they were not recommended for use.
He told a news conference: "We can't recommend these products because their safety and quality is not assured, and so we will recommend that people don't use them."
The MHRA had decided not to ban the products entirely but to work towards a position where they are licensed, he added.
"Smoking is the riskiest thing you can do - we want to enable people to cut down and quit - we don't think a ban is a proportionate action."
The health campaign body, Action on Smoking and Health (ASH), said the action will ensure promotion to children or non-smokers is prohibited.
Deborah Arnott, chief executive of ASH, said: "MHRA regulation can ensure that adult smokers can continue to be able to buy e-cigarettes as easily as tobacco, but promotion to children or non-smokers will be prohibited."
The British Medical Association, which has called for stronger regulation of e-cigarettes, says health professionals should encourage their patients to use a regulated and licensed nicotine replacement therapy (such as patches or gum) to help quit smoking.
It says health professional may advise patients that while e-cigarettes are unregulated and their safety cannot be assured, they are likely to be a lower risk option than continuing to smoke.
Research suggests around 1.3m smokers and ex-smokers use e-cigarettes. Once licensed, they will remain on sale over-the-counter.
Source: BBC News
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