Chemicals in e cigarettes may put users at risk Is vaping a safe alternative to smoking? A1AD Support Ah yesvaping studies saying they contain diacetyl. : r Vaping Vaping, Diacetyl, and Popcorn Lung: Is the Threat Real? Vaping360 All E Cigarettes Emit Harmful Chemicals, but Some Emit More Than Others Berkeley Lab Berkeley Lab News Center E Cigs Include Diacetyl, And Not A Stop Smoking Aid