These are the new vaping laws which come into force this weekend

Some 2.6 million adults in the UK use e-cigarettes and from Sunday they will face new rules which restrict their sale.

The new rules, the Tobacco Products Directive, have been brought in because of health concerns.

Rules governing smoking first covered only traditional cigarettes, but in 2014, a new directive was stretched to include e-cigs.

The regulations were initially introduced last year but come into full force on May 21.

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There are several main changes.

Tank capacity

Firstly, tanks will be regulated to 2ml, hitting many of those who used larger devices up to 5ml.

Flavours

Under the new rules, flavours must be of the highest purity and cannot contain substances which harm human health, other than nicotine.

Advertising bans

Advertisements for vapping will be subjkect to stricter controls under new regulations.

Any promotion of e-cigarettes on TV, radio, in newspapers and magazines will be banned. The internet will be tightly controlled to ensure less promotion.

Packaging

All packaging must include a warning that covers 30 per cent of the surface.

And there must also be the message: “This product contains nicotine which is a highly addictive substance.” displayed.

Liquid testing

Each ingredient used for e-cigarettes will have to have been thoroughly tested. If any liquid does not meet standards, it will not be able to be used. Certain additives will also be banned.

Limit on strength

Unless registered as a medicine, nicotine strength will not be able to be anything more than 20mg/ml.

In response, Graham McKenzie, from e-cigarette provider Flavour Boss, told The Sun that new rules could “along with any changes to pricing that may follow… cause those considering vaping to be put off”.

But Amanda Sandford, information manager at anti-smoking group ASH, said the regulations are “proportionate and appropriate”.