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Electronic cigarettes, or e-cigarettes, are a popular aid for quitting smoking, but it is taking time for scientific research to catch up and provide clear answers on how well they work, and whether they are safe to use for this purpose.

An updated review of the evidence, covering 50 studies and more than 12,000 participants, now provides greater confidence that e-cigarettes with nicotine can help more people to quit smoking than traditional nicotine replacement therapy (such as gums or patches) or e-cigarettes without nicotine. [...]