Propylene Glycol (PG) and Vegetable Glycerine (VG) are the basic e-liquid liquids for your electronic cigarette. The mixing ratio usually varies between 70PG / 30VG and 20PG / 80VG. It is important that the mixing ratio works well with the vape system you are using.
High PG e-liquids are particularly suitable for the relatively weak devices such as pod, pen-style or A.I.O. (All In One) e-cigarettes with high resistance coils (above 1.0 Ohm).
Suitable for relatively low power devices like pod and pen-style e-cigarettes (for example the Justfog Q16 Pro vape pen, Smok Novo or Orion DNA Go pod systems).