Diluents make the base for an e-liquid. They create the vapour, and different types of diluents create different effects.
Propylene glycol (PG) – Offers the best throat hit and is a greater carrier of flavour.
Vegetable Glycerine (VG) – The smoothest option, sweetens up your e-liquid slightly and provides the most vapour.
50:50 PG:VG – A mix which offers a bit of both. Although 50/50 is the most popular, you can make them up to other ratios to suit your taste.
70:30 PG:VG - A mix that will make your juice thinner for more lower powered devices.
Polyethylene Glycol 400 (PEG 400) – Not often used it offers a dryer mouth feel and has its own distinct taste.