e~Aerosols offers electronic cigarette reference liquids and prefilled cartomizers or clearomizers in a variety of products. We offer lab grade (VG) vegetable glycerin and (PG) propylene glycol nicotine solutions in varying proportions of constituents. Our standard solutions are available in any combination of VG/PG, such as 50:50, 25:75, or 75:25. In addition, each refill solution or cartridge is available in varying nicotine concentrations ranging from 0 to 36 mg/ml. Clearomizer or cartomizer type electronic cigarettes are available and come vacuum-packed and prefilled with a determined volume of solution. Flavorings or dyes can also be added upon request. The standard nicotine solutions and electronic cigarettes can be used as control atmospheres when studying retail END products and also help to ensure reliable aerosol delivery during in vivo and in vitro toxicology experiments.