Health experts are pushing for health warning labels to be added to e-cigarettes.

Officials from 15 countries agreed there was now enough evidence to warrant a warning being printed on the packages.

According to health chiefs, the warnings should not be 'softer' than the ones found on cigarettes, Birmingham Live reports.

It became UK law for tobacco packets to carry picture warnings in 2008 and health messages must now take up two-thirds of the pack.

There is only very limited regulation covering the sale of e-cigarettes in the UK. However, they contain nicotine, which is addictive, and have been linked to lung and blood vessel damage.