The World Health Organisation (WHO) have run a Q&A via their website on electronic cigarettes.
Dr Nick Hopkinson, Reader in Respiratory Medicine at the National Heart and Lung Institute Imperial College London, said:
“We know that e-cigarettes are substantially safer than smoking, because the toxic substances present in cigarette smoke are either completely absent, or present at much lower levels.
“Evidence from randomised controlled trials shows clearly that e-cigarettes can help smokers to quit. [...]