Prof Linda Bauld is a knowledgeable advocate of vaping within the Tobacco Control field in the UK. This article is well worth a read.

"Linda Bauld is Professor of Health Policy at the University of Stirling and Deputy Director of the UK Centre for Tobacco and Alcohol Studies. She is a former scientific adviser on tobacco control to the UK government, and recently chaired the NICE guidance group on tobacco harm reduction."

There's no evidence e-cigarettes are as harmful as smoking | Science | The Guardian

Linda also is a signed up supporter of MOVE.