Electronic cigarettes should be banned from indoors and face a number of new curbs over safety fears, the World Health Organization insisted yesterday.

It claims they pose a risk to bystanders of ‘toxicant’ emissions and warns there is limited evidence they help smokers quit.

A report by the organization, which is the public health arm of the United Nations, says legal steps need to be taken to end the use of e-cigarettes in public indoor spaces and workplaces – and to ban sales to children.

It recommends stopping manufacturers advertising the devices as ‘smoking cessation aids’ until they provide scientific evidence, and calls for rules against fruit, sweet or alcoholic-drink style flavours which may encourage younger smokers.