E Cig Refill & E Liquid Ingredients < Go Back

E Liquid Ingredients List

There are three base e liquid ingredients that you’ll tend to find in most vape juices.

These consist of:

  • Propylene glycol (PG)
  • Vegetable glycerine (VG)
  • Flavourings

E liquids can also contain various strengths of nicotine, from completely nicotine free, up to 20mg. This is the highest legal nicotine content in refills or eliquids, set by the EU TPD regulations.

Cigalike e cig refills or pre-filled cartridges contain small amounts of eliquid, produced from the same ingredients.

What are PG & VG (propylene glycol & vegetal glycerine)?

Propylene Glycol

Propylene Glycol or PG is commonly used in the food industry as a preservative. It is also used in the UK medical industry and can be found in asthma inhalers. It is a colourless liquid with a slightly sweet taste. It is primarily used as a ‘base’ ingredient in e juices and has a lower viscosity than vegetable glycerine.

Vegetable Glycerine

Vegetable Glycerine or VG is also a colourless liquid used in the food industry, mainly as a sweetener & thickener. Like PG, VG is also used as a base for e liquids, as well as acting as a sweetener.  It can either be synthetic or derived from plants or animals.


Molecular structure of nicotine - nicotine in e liquid ingredientsNicotine is a stimulant substance which is considered to be addictive. It is a naturally occurring chemical found in the tobacco plant & can also can be found in small amounts in some fruits & vegetables! You can read more about nicotine here.

There are lots of e liquids available without nicotine in, particularly with ‘shortfill’* juices. However, many vapers choose e liquids with nicotine as this can help with the transition of switching from smoking tobacco to vaping.

*’Shortfill’ refers to nicotine-free e liquids which are supplied in larger bottles of 50ml or above. These bottles are ‘short-filled’ to leave space for vapers to add nicotine (usually sold in 10ml nicotine ‘shots’) to make up the desired strength. Shortfill e liquid ingredients usually consist of a higher VG percentage. Click here to find out about our exciting shortfill ranges – coming soon!


E liquids are produced with different levels of PG & VG. Differing ratios of these two ingredients will alter an e liquids throat hit, strength of flavour and amount of ‘cloud’. These mixes are displayed in percentages, often as ’80/20 PG/VG’ or ’80VG/20PG’, for example.

See the chart below for an idea of what effect the different ingredient levels have.





(usually classed as above 60% PG)




50% PG/50% VG
(or 50/50 PG/VG)




(most commonly 70%, 80% or MAX VG*)





*Both Propylene Glycol and Vegetable Glycerine are required to produce an effective e liquid. Therefore even High/Max VG juices tend to contain a small amount of PG, and vice versa.

Can you use high VG e liquids in ego vape pens?

Our Sub Ohm E Liquid range (not sure what sub ohm means?) has an 80VG/20PG ratio and is suitable for use with sub ohm tanks and kits such as the Smok Priv V8 and Aspire PockeX.

It’s not recommended to use sub ohm e liquids in ego vape pens or standard, above ohm tanks. VG has a higher viscosity than PG and therefore atomises at a different rate, which can cause a burning taste. It can also ruin your coils.

Can you use high PG e liquids in sub ohm vape kits & tanks?

The OK Classic E Liquid range is a 70PG/30VG mix for great flavour and subtle vapour production in ego style vape pens and other above-ohm clearomizers and kits.

We don’t recommend using high PG e liquids in sub ohm tanks or kits. High PG e liquids have a thinner consistency and therefore heat & atomise at a faster rate than VG based juices. You might therefore experience a burning taste and very harsh inhale if trying to use them in a sub ohm tank.

Some vapers like to use a 50PG/50VG ratio in sub ohm tanks. This is the highest ratio of PG that we would recommend for use with them.

Confused about sub ohm and above ohm? Read our guide to different types of electronic cigarette for more information.

Shop Classic PG E Liquids

From just £2.50 for 10ml!

15+ delicious flavours with 70PG/30VG

Shop Sub Ohm VG E Liquids

From just £3.21 for 10ml!

8 great flavours with 80VG/20PG