The review is commissioned by PHE and led by researchers from King's College London and Queen Mary University of London.
Almost all of the 2.6 million adults using e-cigarettes in Britain are current or ex-smokers, most of whom are using the devices to help them quit smoking or prevent them going back to cigarettes, the review said.
Not only are e-cigarettes less harmful, the products may be contributing to falling smoking rates among adults and young people, it said.
Emerging evidence suggests some of the highest successful quit rates are now seen among smokers who use an e-cigarette and also receive additional support from their local stop smoking services.
By Ruchi Singh
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