It seems to me that a large majority of articles written about e-cigs today lack facts. However this article doesn't seem to take a side but provides the reader with some useful information.
http://www.cspnet.com/news/tobacco/articles/study-e-cig-vapor-less-injurious-cigarette-smoke
http://www.cspnet.com/news/tobacco/articles/study-e-cig-vapor-less-injurious-cigarette-smoke