The conclusions of this updated Cochrane Review are unchanged since the last review was published two years ago: electronic cigarettes may help smokers stop their smoking, and the included studies did not find any serious side effects associated with their use for up to two years.
Many studies are now underway which may help us understand more about their effects in the future.
Read the NIHR news.
Read the Nuffield Department of Primary Care Health Sciences news.
Jamie is research associate of the Cochrane Tobacco Addiction Group and currently a School funded DPhil student.