Chemicals in e cigarettes mix together to form new, unexpectedly toxic compounds EurekAlert! High concentrations of flavor chemicals are present in electronic cigarette refill fluids Scientific Reports Comparison of the chemical composition of aerosols from heated tobacco products, electronic cigarettes and tobacco cigarettes and their toxic impacts on the human bronchial epithelial BEAS 2B cells ScienceDirect Is vaping a safe alternative to smoking? A1AD Support All E Cigarettes Emit Harmful Chemicals, but Some Emit More Than Others Berkeley Lab Berkeley Lab News Center Facts about Vaping can be very vaporous ScienceUpFirst