E-liquid, or e-juice, is the name for the solution that’s heated up and converted to an aerosol, which e-cigarette users inhale. It consists of PG (propylene glycol), VG (Vegetable Glycerin), flavouring, and nicotine.

Basically, an atomizer heats the liquid or e-juice to its boiling point and that becomes vapour which you can inhale. That’s why smoking e-cigarettes is often called “vaping”.

Typical e-juice, or e-liquid contains four ingredients. These ingredients are Propylene Glycol (PG) or Vegetable Glycerin (VG), water, flavouring, and nicotine.
PG – Propylene Glycol. The fluid has no odour or colour and is less viscous than VG. In vaping, it is used to provide a ‘throat hit’, which some users claim is similar to the sensation experienced when smoking tobacco. It also carries flavour more effectively than VG
VG – Vegetable Glycerin. VG is a natural chemical, derived from vegetable oil, so is safe for vegetarians. It is commonly used in e-liquid to give a ‘thick’ sensation to vapour. The hit from a high VG fluid is a lot smoother than with PG, making it more suitable for sub-ohm vaping. Simply put sub-ohm is vaping on a device whose atomizer coils have a resistance of less than one ohm. Some advanced vapers have devices capable of “sub-ohm” to create more vapour or flavour.