
Despite oft-repeated claims that we lack the research to determine the safety of e-cigarettes, all of their components and constituents have been extensively studied for decades. If we are dealing with facts and looking to science, we can safely conclude that e-cigarettes are not only much safer than tobacco products, but are also relatively harmless by their own accord.
More details here: http://www.vapeloft.com/blog/is-e-cigarette-vapor-safe/