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Electronic cigarettes containing nicotine are more effective in helping smokers quit than gum or patches, according to scientists.

But the researchers have said more evidence is needed on the potential long-term harm of using e-cigarettes.

In a newly updated review published in the Cochrane Library, the team looked at three studies involving 1,498 people that compared e-cigarettes with nicotine replacement therapy, such as patches or gum.

The results showed that more people gave up smoking if they used e-cigarettes containing nicotine than if they used another form of nicotine replacement.