Nicotine liquid, also known as e-liquid or e-juice, is a liquid mixture for the electric cigarette that is vaporized into a breathable form with the electronic cigarette. E-liquid therefore, replaces the tobacco in an regular cigarette. E-liquids main ingredient is usually propylene glycol (PG) which is commonly used in foods and cosmetics. Another alternative base is vegetable glycerol (VG). These can also be used together in desired proportion. Using VG as a base usually results a slightly thicker liquid and produces more vapor than the PG e-liquid but some think it tastes soapy or stuffy. Some still prefer VG only since PG can trigger an allergic response in certain people.
Nicotine liquid comes in a variety of flavors and a few basic nicotine levels. From the many nicotine liquid flavors offered by different manufacturers, two seem to be more popular: tobacco and mint. These two flavors have different names and slightly different tastes depending on the brand—names like Original Tobacco, Cured Tobacco, or Arctic Mint may be names for the same flavor or variants of the flavor. There are nicotine liquid flavors made to taste like those of traditional cigarettes, for example, Marlboro, Camel, Winston, or Kent. The most common of those is Marlboro. Nicotine concentrations range from high doses (to mimic the content of regular cigarettes) to midrange and low doses (that mimic the nicotine content of “light” and “ultra light” cigarettes). Solutions are also available which contain little or no nicotine.
Smokers using the electric cigarette have a better choice of flavors than those who smoke traditional cigarettes. While it is rare for traditional cigarettes to have flavors of coffee, vanilla, strawberry, or chocolate, most nicotine liquid and electric cigarette makers and sellers offer those flavors.