Table of Contents
- Introduction
- What is Vegetable Glycerin (VG)?
- What is Propylene Glycol (PG)?
- Comparing VG and PG: A Side-by-Side View
- Common E-Liquid Ratios and What They Mean
- Matching Your Liquid to Your Hardware
- The Relationship Between Nicotine Type and Ratios
- Environmental Factors: Temperature and Viscosity
- Steeping and Its Effect on Ratios
- Sensitivity to Propylene Glycol
- Storage and Shelf Life of VG/PG
- Conclusion
- FAQ
Introduction
When you first start exploring the world of e-liquids, the technical abbreviations on the labels can feel overwhelming. Two of the most important terms you will encounter are VG and PG. These represent the base fluids that carry the nicotine and flavorings in every bottle of vape juice. At Vapor Authority, we believe that understanding these components is the first step toward finding a setup that truly satisfies your personal preferences.
Warning: This content is intended for adults of legal vaping age only. Vaping products contain nicotine, which is an addictive chemical. These products are not intended for use by minors, non-smokers, pregnant or breastfeeding women, people with heart conditions, high blood pressure, or asthma. Consult a physician if you have concerns about whether vaping products are appropriate for you.
The balance between these two ingredients dictates almost every aspect of your experience. It affects how much vapor you produce, how the flavor tastes, and how the "throat hit" feels when you inhale. Choosing the wrong ratio can lead to leaking tanks or burnt coils, while the right ratio can make your favorite flavor shine. This guide will explain exactly what VG and PG are and how to choose the right balance for your device.
What is Vegetable Glycerin (VG)?
Vegetable Glycerin, commonly referred to as VG, is a thick, clear, and odorless liquid. It is typically derived from vegetable oils, such as soy, coconut, or palm oil. In the context of e-liquid, VG serves as the primary agent responsible for creating thick, dense clouds of vapor.
VG has a slightly sweet natural taste, which can sometimes impact the overall flavor profile of an e-liquid by making it seem a bit more "mellow" or sugary. Because it is a viscous (thick) substance, it does not flow as easily as water. This thickness has a significant impact on how e-liquid interacts with your hardware.
The Role of VG in Vapor Production
If you enjoy seeing large clouds of vapor, you are looking for a high-VG liquid. Because VG is dense, it requires more heat to vaporize properly. When it does vaporize, it creates a much thicker "fog" than PG. This is why "cloud chasers"—vapers who prioritize vapor volume—almost always use liquids with at least 70% or 80% VG content.
VG and Throat Hit
One of the standout characteristics of VG is its smoothness. It provides a very minimal sensation at the back of the throat during inhalation. For vapers who find high nicotine or high PG liquids too harsh or irritating, increasing the VG ratio is a common solution. It creates a "silky" mouthfeel that many experienced vapers prefer.
Wicking Challenges with High VG
Because VG is thick, it takes longer for the cotton wick inside your coil to absorb it. If you use a high-VG liquid in a small device with tiny wicking holes, the liquid may not move fast enough to keep the cotton saturated. This can lead to "dry hits," which happen when the coil heats up dry cotton and creates a burnt taste. Generally, high-VG liquids are best suited for larger sub-ohm tanks and rebuildable atomizers.
What is Propylene Glycol (PG)?
Propylene Glycol, or PG, is a synthetic liquid that is much thinner and more fluid than VG. Unlike VG, it is completely tasteless and odorless. While it produces much less vapor than its counterpart, it is highly efficient at carrying flavor and delivering a specific physical sensation.
PG is used in a wide variety of common household items, including food colorings, flavor extracts, and even some medications. In vaping, it is the ingredient that most closely mimics the physical experience of traditional smoking.
PG as a Flavor Carrier
Because PG is tasteless and has a lower viscosity than VG, it is an excellent carrier for complex flavorings. It allows the intricate notes of a dessert or fruit profile to come through clearly without the natural sweetness of VG interfering. Most concentrated flavorings used in the industry are actually suspended in a PG base before being mixed into the final e-liquid.
The Famous "Throat Hit"
The "throat hit" is the tingling or slightly sharp sensation at the back of the throat when inhaling. PG is the primary contributor to this feeling. Many adult vapers who have recently transitioned from smoking look for a higher PG ratio because it replicates the tactile sensation they are used to.
Viscosity and Leaking
Since PG is thin, it flows very easily. This makes it ideal for smaller devices, such as pod systems or older clearomizers, because it can soak into small wicks almost instantly. However, if you use a high-PG liquid in a large sub-ohm tank designed for thick liquids, you may experience leaking. The thin liquid can sometimes seep through the airflow vents because the gaskets and cotton are not dense enough to hold it back.
Comparing VG and PG: A Side-by-Side View
To help you decide which ingredient should dominate your bottle, it helps to look at them as a direct trade-off.
- Vapor Production: VG is the winner here. High VG equals big clouds; high PG equals discrete, thin vapor.
- Flavor Intensity: PG wins on clarity. While VG is sweet, PG carries the intended flavor of the juice more accurately.
- Throat Hit: PG provides the "kick." VG provides a smooth, gentle inhale.
- Thickness: VG is thick and syrupy. PG is thin and watery.
- Device Compatibility: High VG requires high-power devices (sub-ohm). High PG works best in low-power, smaller devices (pods).
Common E-Liquid Ratios and What They Mean
E-liquids are rarely 100% VG or 100% PG. Instead, they are mixed in specific ratios to balance the benefits of both. Here at Vapor Authority, we carry a wide variety of these blends to ensure every vaper finds their "sweet spot."
50/50 VG/PG Ratio
This is the ultimate balanced blend. It provides a decent amount of flavor clarity and a noticeable throat hit without being overwhelming. It also produces a moderate amount of vapor. This ratio is the standard for most nicotine salt e-liquids and is perfectly suited for pod systems and mouth-to-lung (MTL) devices.
70/30 VG/PG Ratio
This is currently the most popular ratio in the vaping industry, particularly for freebase nicotine e-liquids. It offers a smooth inhale and excellent cloud production while still retaining enough PG to deliver a punchy flavor. Most sub-ohm tanks—those using coils with a resistance below 1.0 ohm—are designed specifically to run on 70/30 blends.
80/20 VG/PG and "Max VG"
"Max VG" does not necessarily mean 100% VG. It usually means the manufacturer used as much VG as possible, only using PG where it was necessary to carry the flavorings. These liquids are very thick and are designed for high-wattage vaping. They produce massive clouds and almost no throat hit.
Matching Your Liquid to Your Hardware
Using the wrong VG/PG ratio for your device is one of the most common mistakes vapers make. It can lead to a poor experience and can even damage your equipment.
Sub-Ohm Tanks and Box Mods
Sub-ohm vaping involves using a coil with a resistance lower than 1.0 ohm. These devices operate at higher wattages and have large airflow and wicking ports.
- Best Ratio: 70/30 or 80/20 VG/PG.
- Why: These devices vaporize liquid quickly. The thickness of VG prevents the tank from leaking, and the high wattage produces the massive clouds these users expect.
- Note: If you use a high-PG liquid (like 50/50) in a high-wattage sub-ohm tank, the throat hit might be painfully harsh, and the tank will likely leak.
For a compact option, the SMOK T-Air Sub Ohm Tank is built for high-output use, while the UWell Valyrian IV Sub Ohm Tank is another strong match for thicker blends.
Pod Systems and MTL Tanks
Mouth-to-lung (MTL) devices are designed to be inhaled like a traditional cigarette—drawn into the mouth first, then into the lungs. These devices use higher-resistance coils (above 1.0 ohm) and operate at lower wattages.
- Best Ratio: 50/50 or 60/40 VG/PG.
- Why: These coils have smaller wicking holes. They need the thin consistency of PG to stay saturated.
- Note: If you use a 70/30 or 80/20 VG liquid in a small pod, you will likely experience "dry hits" because the thick liquid cannot enter the coil fast enough.
If you prefer a streamlined setup, the Vaporesso LUXE QS Pod System Starter Kit is a strong example of a pod-friendly device, and the pod starter kits collection is a useful place to compare similar options.
The Relationship Between Nicotine Type and Ratios
The type of nicotine in your juice often dictates the VG/PG ratio you will find.
Freebase Nicotine
Freebase nicotine is the "traditional" nicotine used in vaping for years. It is typically found in lower strengths (3mg, 6mg, or 12mg). Because freebase nicotine has a naturally higher pH level, it becomes harsher as the concentration increases. To offset this harshness, manufacturers usually pair freebase nicotine with a high-VG base (like 70/30).
Nicotine Salts
Nicotine salts are created by adding an acid (usually benzoic acid) to freebase nicotine. This lowers the pH and allows for much higher nicotine concentrations (25mg to 50mg) without a harsh throat hit. Because these are designed for low-power pod systems, they are almost always mixed at a 50/50 ratio to ensure proper wicking.
For more flavor-forward options, the Solace E-Juice collection is one of the brand pages you can explore alongside other e-liquid choices.
Environmental Factors: Temperature and Viscosity
It is important to remember that the thickness of your e-liquid is not permanent. Temperature plays a massive role in how VG and PG behave.
In cold weather, VG becomes significantly thicker—almost like cold honey. If you leave your vape in a cold car and then immediately try to use it, you might get a dry hit even if you are using the "correct" ratio. Conversely, in extreme heat, e-liquid becomes much thinner. A 70/30 liquid that works perfectly in the spring might start leaking from your tank on a 100-degree summer day because the heat has reduced its viscosity.
Steeping and Its Effect on Ratios
Steeping is the process of letting e-liquid sit for a period of time to allow the flavors to fully bond with the VG and PG base. While steeping does not change the actual ratio of the ingredients, it does change how they feel.
Freshly made high-VG juice can sometimes feel "separated," where the sweetness of the VG and the flavor of the PG don't quite mesh. As a juice steeps, the PG-based flavorings more thoroughly penetrate the thick VG molecules. This results in a smoother, more cohesive taste. At Vapor Authority, we carry only high-quality, US-made e-liquids that have been properly formulated for the best possible experience right out of the bottle.
Sensitivity to Propylene Glycol
While the vast majority of vapers have no issues with PG, a small percentage of the population has a sensitivity or a mild allergy to it. Symptoms of PG sensitivity can include an uncomfortably sore throat, skin rashes, or sinus irritation.
If you find that even 50/50 liquids feel like they are burning your throat, or if you develop a cough that doesn't go away, you might be sensitive to PG. In these cases, vapers often switch to "Max VG" or 100% VG liquids. Note that if you move to a 100% VG liquid, you must ensure your hardware can handle the extreme thickness of the fluid.
Battery Safety for High-Wattage Users
If you are choosing high-VG liquids, you are likely using a high-wattage box mod. These devices often use external lithium-ion batteries, such as 18650s or 21700s. Handling these batteries safely is critical for a good experience.
- Inspect Wraps: Always check the plastic wrap on your batteries. If there is a tear or a nick, do not use the battery.
- Use a Case: Never carry loose batteries in your pocket or bag. If they touch keys or coins, they can short-circuit. Always use a plastic battery case.
- Dedicated Chargers: While many mods allow for USB charging, we recommend using a high-quality external charger for more consistent and safer charging.
- Match Your Pairs: If your device uses two batteries, use a "married" pair—meaning they are the same brand and model, purchased at the same time, and always charged and discharged together.
Storage and Shelf Life of VG/PG
Proper storage is essential to keep your VG/PG ratios from degrading. E-liquid should always be stored in a cool, dark place. Exposure to direct sunlight or extreme heat can cause the nicotine to oxidize (turn peppery) and the flavorings to break down.
Most e-liquids have a shelf life of about one to two years. Over time, the VG and PG may begin to separate slightly, or the liquid may darken. While this is a natural process, if the liquid becomes excessively cloudy or develops a strange smell, it is time to replace it. Always keep your e-liquids out of reach of children and pets, and ensure the child-resistant caps are fully tightened.
Conclusion
The ratio of VG to PG in your vape juice is not just a technical spec; it is the blueprint for your entire vaping experience. By understanding that VG provides the clouds and smoothness while PG provides the flavor and throat hit, you can make an informed choice that matches your specific hardware.
- Choose High VG (70/30+) if you use a sub-ohm tank and want big clouds and a smooth inhale.
- Choose Balanced (50/50) if you use a pod system or MTL tank and want a cigarette-like throat hit.
- Watch Your Hardware: Ensure your coil's wicking holes match the thickness of your liquid to avoid leaks or burnt hits.
- Store Correctly: Keep your juice in a cool, dark place to maintain the integrity of the blend.
Whether you are looking for a high-VG dessert flavor or a balanced nicotine salt for your pod system, we have the perfect blend for you. Shop our full collection of US-made e-liquids at Vapor Authority and find your perfect ratio today.
FAQ
Can I mix two different VG/PG ratios together?
Yes, you can mix different ratios of the same flavor (or different flavors) to create a custom blend. For example, mixing equal parts of a 50/50 liquid and a 70/30 liquid will result in a 60/40 ratio. Just ensure that the nicotine strengths are compatible with your needs before mixing.
Why does my high-VG juice taste burnt in my pod system?
High-VG juice is very thick and moves slowly. Small pod system coils have tiny wicking holes that cannot absorb thick VG fast enough to keep up with the heater. This causes the cotton to dry out and burn, leading to a "dry hit."
Is a 100% PG e-liquid possible?
While technically possible, 100% PG e-liquids are very rare today because they are extremely thin and produce almost no visible vapor. They are also prone to leaking in nearly every modern tank. Most "high PG" liquids on the market today are actually 50/50 or 60/40 blends.
Does the VG/PG ratio affect how long my coil lasts?
Yes, it does. High-VG liquids are thicker and often contain more sweeteners, which can "gunk up" a coil faster than thinner, high-PG liquids. However, using a high-PG liquid in a tank meant for VG can cause leaking, which can also damage the internal components of your device.
