Frontiers Aerosolized nicotine from e cigarettes alters gene expression, increases lung protein permeability, and impairs viral clearance in murine influenza infection Differential Toxicity of Electronic Cigarette Aerosols Generated from Different Generations of Devices In Vitro and In Vivo Environment & Health A review of constituents identified in e cigarette liquids and aerosols Short Term and Long Term Effects of Electronic Cigarettes on Mouse Lungs Following Nose Only Exposures Chemical Research in Toxicology Teens using e cigarettes show evidence of same toxic chemicals as smokers: Study ABC News Pyrazine Additives E Cigarette Forum