Are E-Cigarettes Safe?

According to MNN.com, "When e-cigarettes were introduced to the U.S. market in 2007, they were billed as a safe alternative to conventional tobacco cigarettes. But since then various studies have found that these e-cigs may not be so harmless after all." Berkeley Lab researcher and the study’s corresponding author Hugo Destaillats, in a statement, “Advocates of e-cigarettes say emissions are much lower than from conventional cigarettes, so you’re better off using e-cigarettes.