Can electronic cigarettes help people stop smoking, and do they have any unwanted effects when used for this purpose?

Among the nearly 100 reviews produced by the Cochrane Tobacco Addiction Group, their review of the use of electronic cigarettes in smoking cessation is now being managed as a living systematic review, with monthly searches to keep an eye on the evidence base, so that the published review can be refreshed as necessary. The review was re-badged as a living review in 2021 and its fourth update in this format was published in January 2024. Here's one of the authors, Ailsa Butler from the University of Oxford in the UK to summarise the latest findings.