Research indicates that certain flavoring chemicals used in e cigarettes can irritate lung tissue and trigger inflammatory responses in laboratory settings. Some compounds, such as diacetyl, have been linked to respiratory damage when Navy providing further guidance on electric nicotine delivery systems Top Stories militarynews.com Smoking, vaping, hookah & e cigs Power to the Parent Vaping Exposes Users to More Toxic Metals Than Smoking Cigarettes inChemistry