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Professor Rachel Isba, who is leading the vaping service at Alder Hey, told a safety and quality assurance committee last year that more data was needed on the number of children addicted to nicotine.

Prof Isba noted she was aware of complications caused by vapes being used to inhale other substances, including the dangerous synthetic drug spice - which can cause cardiac arrest.

Phil Smith, Director General of ISBA, which represents UK advertisers, said he "fully supported" the changes.

The ISBA’s annual compilation of state laws and regulations is now nearly 1,700 pages, or about 500 pages longer than most versions of the Bible.

It has also emerged that ISBA, a trade body which represents major UK advertisers, will meet Facebook this week.