The primary cartridge ingredient is propylene glycol, and the secondary ingredients are water, nicotine and a flavor to replicate the taste of traditional smoking.
Propylene Glycol ? The Food and Drug Administration (FDA) has determined propylene glycol to be ?generally recognized as safe? for use in food and propylene glycol is used in cosmetics and medicines. It is used in food coloring, and flavoring, as an additive to keep food, medicines and cosmetics moist, and in machines that simulate smoke, although usage in simulating smoking devices is not currently included in the list of uses recognized by the FDA.
Water ? Water which is usually filtered.
Nicotine ? is an alkaloid found in certain plants, predominately tobacco, and in lower quantities, tomatoes, potatoes, eggplants, cauliflower, bell-peppers and some teas.
Ethanol ? is 200% proof alcohol (same as used in making alcoholic beverages, and is used to extract nicotine from the tobacco leaf.
Glycerol (glycerin) ? Glycerol is a chemical compound also commonly called glycerin or glycerine. It is a colorless, odorless, viscous liquid that is widely used in pharmaceutical formulations. For human consumption, glycerol is classified by the FDA among the sugar alcohols as a caloric macronutrient.