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We want to offer smokers a "range of choices" to help them quit smoking for good, says Professor Kevin Fenton from Public Health England.

Speaking to 5 live Breakfast, he said by licencing and regulating e-cigarettes, the NHS could add them to the "tool kit" to help people give up smoking.

"Smoking costs the NHS 2bn a year", he said, adding that it is a major drain on the service.

Responding to concerns published in the American Medical Association, Professor Fenton said it is "very unusual" for e-cigarettes to introduce children to smoking.

This clip is originally from 5 live Breakfast on Wednesday 19 August 2015.