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This paper turned up in my weekly search of PubMed. [...] The commentary claims to show the “invalidity” of the statements made by Public Health England (PHE) and the Royal College of Physicians (RCP) regarding the relative risk of vaping and smoking – in short that vaping is likely to be at least 95% lower risk than smoking. As this is an important harm-reduction risk communication, it is worth asking: how valid is this critique?