Electronic cigarettes are to be classed as "medicines" under new proposals to tighten up the regulation of nicotine-containing products.
Manufacturers are to face tough new tests before they can sell their e-cigarettes as "licensed products", the Medicines and Healthcare products Regulatory Agency (MHRA) said.
The move will also mean that licensed e-cigarettes can be prescribed by medics to help smokers cut down or quit.
The MHRA will regulate the products so that there is a consistent standard across all licensed products sold over the counter.
E-cigarettes are set to be classified as "medicines" in a bid to tighten up regulation. But what are e-cigarettes and are they safe to use?
The MHRA says e-cigarette nicotine levels can vary from from batch to batch, casting doubt on how useful they are to those aiming to quit.