Vaping has moved on from being a simple alternative to smoking. It has developed its own culture built around equipment, technique and personal preference, and cloud chasing sits within that culture as one of its most recognisable pursuits.
Much of that pursuit comes down to what the liquid itself is made of. Propylene glycol and vegetable glycerine are the two base ingredients in every e-liquid, and the ratio between them determines how a vape performs. High VG liquid occupies one end of this spectrum, and its properties explain why so many vapers reach for it first.
The Composition Behind High VG Liquid
Vegetable glycerine is a thick, plant-derived liquid that produces dense vapour when heated, while propylene glycol is thinner and carries flavour more efficiently. Most e-liquids blend the two, and the exact ratio changes the vaping experience considerably.
A 50/50 mix balances flavour and vapour in roughly equal measure, and a 70/30 blend leans further toward vapour without sacrificing too much taste. High VG liquid typically starts at 70% VG and can climb as high as 80% VG or above, paired with a correspondingly lower share of PG. This composition is what separates it from standard e-liquids and gives it the qualities that cloud chasers look for.
How High VG Liquid Increases Vapour Production
The thickness of vegetable glycerine is directly responsible for the volume of vapour a device produces, and this is why high VG vape juice is closely associated with sub-ohm vaping and large cloud output. Heavier liquid holds more vapour when it turns to gas, so a higher VG percentage naturally means bigger clouds, and this effect becomes more noticeable once the right hardware is paired with the right liquid.
Viscosity and Wicking
Thicker liquid moves more slowly through cotton. Devices built for VG-heavy blends use wider wicking channels and looser coil builds to keep pace with that demand.
Coil and Wattage Compatibility
Sub-ohm coils offer lower resistance, which allows higher wattages to pass through the liquid. That extra power vaporises thick VG far more efficiently than a standard coil could manage.
Airflow and Device Design
Wider airflow slots cool the vapour as it forms and let larger volumes pass through the mouthpiece. This design choice works alongside the liquid’s thickness rather than against it.
The Effect of High VG Vape Juice on Flavour
Flavour compounds dissolve more readily in propylene glycol than in vegetable glycerine, so a liquid with a lower PG content can taste slightly muted compared with one built for flavour above all else. This does not mean high VG vape juice lacks taste, and manufacturers account for the difference by increasing flavour concentration during production to compensate.
Steeping, which allows a liquid to rest and develop before use, also plays a bigger role in high VG blends, since the process gives flavourings more time to distribute evenly through a thicker base. Vapers who switch from a PG-heavy liquid to a VG-heavy one often notice a softer throat hit alongside the change in taste, and both shifts come from the same underlying chemistry rather than a fault in the liquid itself.
Matching High VG Vape Juice to Your Device
Selecting a suitable blend depends on the device being used and the result a vaper wants. Sub-ohm tanks and mesh coils are generally built with high VG vape juices in mind, and pairing the two produces a steadier result than forcing thick liquid through hardware designed for mouth-to-lung vaping.
Tank design plays a direct part in this. Wider bores and looser wicking allow thicker liquid to feed the coil properly, while narrower, mouth-to-lung style tanks are built around thinner, higher-PG liquids instead.
Refillable tanks used with nicotine-containing liquid are also subject to a maximum capacity, a rule set out in the government’s guidance on e-cigarette regulation. This limit applies regardless of the liquid’s VG content, so vapers using high VG liquid in a sub-ohm tank still need to check that the device itself meets the legal capacity before it goes on sale.
Getting this pairing right takes more than checking the VG percentage on the bottle. Coil resistance, wattage range and airflow design all need to work with the liquid, and a mismatch in any one of these areas is usually what causes dry hits or leaking.
Getting the Balance Right
Cloud production and flavour depend on the same two ingredients, and the ratio between them pushes a liquid toward one outcome or the other. A vaper who values thick, visible vapour above all else will find that a higher VG content rewards that preference, provided the device and coil are matched to the liquid rather than left as an afterthought.
Buyers who stick to registered retailers of premium e-liquids are also better placed to know exactly what they are vaping, and why it behaves the way it does.
