The liquid or juice that is normally used in cartridges is known as e-juice or e-liquid. Think of it as the gas required to drive a car. It is normally composed of three main elements: The first being an agent that gives off vapor. The second component is nicotine for stimulation and third is flavors to produce test. There are 2 kinds of elements that are used to produce vapor:
· Propylene Glycol (or PG) is the element that is used regularly
· Vegetable Glycerin (or VG) is also used normally by individuals who are allergic to PG
Most of the e-liquids that are available on the market are Propylene Glycol based and if you have just started out with vaping, make sure you only order a sampler or a small quantity of e-juice from an e cig online store. PG usually yields sweeter e-liquids and a smaller amount of vapor whereas VG based e-juices are likely to be less sweet and emits more vapor. Every now and then, you will come across e-liquids that have both PG and Vg mixed up together. The reason for this that VG is normally thicker than PG and Vegetable Glycerin is many a time mixed with Propylene Glycol to make it more solvable and sometimes Vegetable Glycerin is mixed into Propylene Glycol for added consistency.
A good thing about e-liquids is that they come in different nicotine levels varying between 0 nicotine to up to 4.8%. And these e-liquids are normally filled in Cartridges and then used for vaping e-cigs.