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[Correspondence] E-cigarettes are less harmful than smoking

The Lancet Editorial1 criticising Public Health England’s review of electronic cigarettes (e-cigarettes) focused on three supposed short-comings of our paper:2 a lack of hard evidence, no formal criteria used, and so relied on the opinions of participants, and potential bias arising from the selection of participants and the declared conflicts of interest of some authors.2 As authors of the original paper,2 we believe that these three criticisms have over-generalised the evidence issue, did not respect the knowledge and experience of the experts selected, and did not take into account the many measures used to minimise potential bias.