The flavour of an e-liquid is influenced by more than the flavour concentrates included in its formulation. The balance between VG and PG can also affect how an e-liquid tastes, feels, and delivers different flavour notes. Even when the same flavour concentrates are used, changing the ratio of vegetable glycerin (VG) and propylene glycol (PG) can produce a noticeably different flavour experience.
This happens because VG and PG have different physical and sensory characteristics. They interact with flavour compounds, vapour production, viscosity, heating conditions, and device components in different ways. Understanding these relationships helps explain why changing the VG and PG ratio can alter an e-liquid’s flavour profile.
What Are VG and PG?
VG and PG are two commonly used base ingredients in e-liquid formulations.
Vegetable glycerin is a relatively thick liquid with a mild natural sweetness. It contributes significantly to vapour production and gives e-liquid a thicker consistency.
Propylene glycol is thinner than VG and is commonly used as an effective carrier for flavour compounds. It is also associated with a more pronounced delivery of individual flavour characteristics.
The ratio between these two ingredients determines several physical properties of an e-liquid. Consequently, changing that ratio can influence how flavour is presented.
How Can PG Influence Flavour?
PG can play an important role in carrying flavour compounds throughout an e-liquid. Because it has a relatively thin consistency, flavour components can be distributed effectively through the formulation.
A higher proportion of PG can therefore contribute to a more direct presentation of flavour. Fruit, mint, beverage, dessert, and other flavour notes may appear more distinct depending on the overall formulation.
This does not mean that increasing PG automatically makes an e-liquid more flavourful. Flavour concentration, formulation, nicotine type, device characteristics, coil temperature, and airflow also contribute to the final result.
Instead, PG should be viewed as one of several factors that influence how flavour is delivered.
How Can VG Change Flavour Perception?
VG has different characteristics from PG. It is thicker, contributes to vapour production, and has a mild natural sweetness.
When the proportion of VG increases, the e-liquid generally becomes more viscous and produces a different vapour character. The thicker texture and increased vapour production can influence how flavour is perceived.
Certain flavour profiles may appear softer or fuller in a higher-VG formulation. This can be particularly noticeable with rich dessert, cream, bakery, or fruit-based flavour combinations.
The flavour ingredients themselves have not necessarily changed. Instead, the surrounding base has changed, affecting the way those ingredients are experienced.
Why Does E-Liquid Viscosity Matter?
One of the most important differences between VG and PG is viscosity. VG is considerably thicker, while PG has a thinner consistency.
This difference affects how e-liquid moves through the wicking system and reaches the coil. The rate at which the e-liquid reaches the heating element can influence how consistently flavour is delivered.
A change in the VG and PG ratio therefore changes more than just the texture of the liquid. It can also change the interaction between the e-liquid and the hardware used to heat it.
This is one reason the same flavour formulation can produce different results after its VG/PG ratio is changed.
How Does Vapour Production Affect Flavour?
VG is strongly associated with vapour production. Increasing the VG proportion can result in a denser vapour characteristic, depending on the device and operating conditions.
The amount and density of vapour can influence flavour perception because flavour compounds are being delivered within that vapour.
A formulation with a higher VG content may create a fuller overall experience, while a formulation with a higher PG proportion may provide a more direct flavour presentation.
The difference is not necessarily a change in the actual flavour ingredients. It is a change in the way those ingredients are delivered and perceived.
Why Can the Same Flavour Taste Different at Different Ratios?
Consider an e-liquid containing several fruit flavour notes. The formulation might include sweet, tart, and aromatic components designed to work together.
Changing the VG and PG ratio can alter the physical characteristics of the e-liquid and the way vapour is produced. As a result, one flavour note may appear more prominent while another may seem softer.
The same principle applies to complex dessert or beverage profiles. Creamy, sweet, cooling, fruity, and aromatic characteristics can be perceived differently depending on the base formulation.
This is why an e-liquid’s flavour name alone does not provide a complete picture of its flavour characteristics.
How Do VG and PG Work With Different Devices?
The device used to vaporize an e-liquid is another important part of the equation. Coil resistance, power output, airflow, wicking material, and chamber design can all influence how VG and PG behave.
A higher-VG formulation may interact differently with a particular wicking system than a formulation containing more PG. Similarly, different power levels can change the amount of e-liquid converted into vapour.
Airflow also influences the final presentation by controlling how much air mixes with the aerosol.
Therefore, changing the VG and PG ratio can produce one result in one device and a somewhat different result in another.
Does Nicotine Type Affect the Overall Flavour?
Nicotine formulation can also be part of the overall e-liquid composition. Nicotine salts and freebase nicotine have different chemical characteristics and can be used in different formulations.
When the nicotine type changes alongside the VG and PG ratio, the overall flavour experience may also change. This is because the e-liquid’s complete formulation has changed rather than simply one ingredient.
For meaningful comparisons, it is useful to consider the complete ingredient profile rather than examining VG and PG in isolation.
How Can VG and PG Affect Different Flavour Categories?
Different flavour families can respond differently to changes in formulation.
Fruit flavours may present their sweet, tart, or aromatic characteristics differently depending on the balance of VG and PG.
Dessert flavours can develop a fuller texture when combined with a higher VG formulation, particularly when the profile includes creamy or bakery notes.
Mint and cooling flavours may have a different perceived intensity depending on the e-liquid base and how the aerosol is produced.
Beverage flavours containing multiple flavour layers can also present different characteristics when the VG and PG ratio changes.
What Should Be Considered When Comparing VG and PG Ratios?
When comparing two e-liquids, the VG/PG ratio should be considered alongside other factors, including:
- Flavour concentration
- Nicotine type and strength
- E-liquid viscosity
- Coil resistance
- Recommended power
- Airflow configuration
- Wicking system
- Device design
Keeping these factors consistent makes it easier to identify whether a change in flavour is related specifically to the VG and PG ratio or to another part of the setup.
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Conclusion
Changing the VG and PG ratio can influence an e-liquid’s flavour profile because VG and PG have different physical and sensory characteristics. PG can contribute to direct flavour delivery, while VG influences viscosity, vapour production, texture, and overall flavour presentation.
The final experience is also affected by the flavour formulation, nicotine type, coil, power, airflow, and device design. As a result, changing the VG and PG ratio can make the same flavour profile appear different without changing the underlying flavour concentrates. Understanding these factors provides a clearer picture of how e-liquid formulation influences flavour.