E-liquid consists of three ingredients. The nicotine provides the kick notable of cigarettes, the flavouring adds the excitement in vaping, and a diluent ensures the balance between strength and flavour. You may be familiar with the nicotine and flavouring, but what purpose does the diluent serve?
By definition, a diluent is an agent added to a substance to help liquid flow faster than normal rate by making it thinner. Petroleum pipelines need diluents to easily transport crude oil across the length of the pipeline from rig to refinery. Without them, pipeline pumps have to exert force just to make the thick crude oil move (even if lighter hydrocarbons in the oil are also diluents themselves).
Diluents in e-liquids work in the same principle. Aside from getting the strength and flavour just right, the diluent is also responsible for bringing both substances to the user. This is done by converting the nicotine and flavouring into vapour form, allowing it to be inhaled by the user. As nothing is burned in the process, unlike in tobacco cigarettes, the vapour itself is safe.
There are three kinds of diluents commonly used for e-liquids. Propylene glycol (PG) and vegetable glycerine (VG) are added in various proportions but usually 80 percent PG and 20 percent VG. However, PG and VG can both stand alone, which is perfect for users with known allergies to either chemicals.