Table of Contents

1. Introduction
2. What is Vegetable Glycerin (VG)?
3. What is Propylene Glycol (PG)?
4. The Practical Differences Between VG and PG
5. Common PG/VG Ratios and Who They Are For
6. Hardware Compatibility: Matching Ratios to Coils
7. PG Sensitivity and Allergies
8. Nicotine Types and Their Relationship with PG/VG
9. Battery Safety for High-Powered Vaping
10. Storage and Handling of E-Liquids
11. Conclusion
12. FAQ

Introduction

Choosing the right e-liquid is the most important factor in determining the quality of your vaping experience. While flavor and nicotine strength often get the most attention, the foundation of every bottle is the base liquid, which consists of two primary ingredients: Vegetable Glycerin (VG) and Propylene Glycol (PG). At Vapor Authority, we frequently help customers navigate these ratios to ensure their hardware performs correctly and their personal preferences for vapor and flavor are met. Understanding how these two components interact allows you to fine-tune your setup for the perfect balance of throat hit, cloud production, and flavor intensity.

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.

This guide provides a detailed breakdown of what VG and PG are, how they differ, and how to choose the ideal ratio for your specific device and vaping style.

What is Vegetable Glycerin (VG)?

Vegetable Glycerin, commonly referred to as VG, is a thick, odorless, and colorless liquid typically derived from vegetable oils, such as palm, soy, or coconut oil. It has a slightly sweet taste and a high level of viscosity, meaning it is much thicker than water or PG. In the vaping industry, reputable manufacturers use USP (United States Pharmacopeia) grade VG to ensure purity and consistency.

Characteristics of VG

VG is responsible for the "body" of the vapor. Because it is a dense liquid, it produces much thicker and more voluminous vapor clouds when heated. This makes it the primary ingredient for enthusiasts who enjoy "cloud chasing" or using high-performance hardware.

One of the most notable traits of VG is its smoothness. It provides a very mild sensation on the throat, which is ideal for vapers who find high-PG liquids too harsh or irritating. However, because it has a natural sweetness, it can sometimes subtly alter the intended flavor profile of an e-liquid, making dessert and fruit flavors taste richer while potentially masking the sharp notes of tobacco or menthol.

Practical Implications of High VG

If you use an e-liquid with a high VG concentration (70% or higher), you must ensure your hardware can handle it. Because the liquid is so thick, it takes longer for the cotton wick inside your atomizer coil to absorb it. If the liquid cannot reach the coil fast enough, you may experience a "dry hit"—the unpleasant taste of burnt cotton. High VG liquids are best suited for sub-ohm vaping, which involves using a coil with a resistance below 1.0 ohms. These devices typically have large wicking ports designed to draw in thick liquids quickly.

What is Propylene Glycol (PG)?

Propylene Glycol, or PG, is a synthetic organic compound that is much thinner and less viscous than VG. It is odorless and tasteless, though it is highly effective at carrying flavors. PG is used in a wide variety of common household products, including food flavorings, pharmaceutical formulations, and even asthma inhalers.

Characteristics of PG

PG serves two main purposes in a vape juice: carrying flavor and providing a "throat hit." Because PG is tasteless, it does not interfere with the complexity of the e-liquid’s flavoring agents. This results in a sharper, more defined flavor profile compared to high-VG blends.

Furthermore, PG provides a physical sensation at the back of the throat that mimics the feeling of traditional combustible products. This "throat hit" is often a priority for adult vapers who are transitioning from smoking and want a familiar physical experience.

Practical Implications of High PG

High PG liquids (50% or higher) are very thin and flow easily. This makes them ideal for smaller, lower-powered devices such as pod systems and basic starter kits. These devices often have smaller wicking holes that would struggle to process thick VG, but they can easily stay saturated with thin PG.

However, because PG is so thin, using it in high-powered sub-ohm tanks can lead to leaking. The liquid can flow too quickly through the seals or out of the airflow intake. If you notice your tank is "spitting" hot liquid into your mouth or leaking from the base, your e-liquid ratio may be too thin for your current coil.

The Practical Differences Between VG and PG

To choose the right juice, you must understand the trade-offs between these two ingredients. Most e-liquids on the market today use a blend of both to capture the benefits of each.

1. Flavor Intensity

PG is an excellent flavor carrier. If you are a "flavor chaser" who wants to experience every subtle note of a complex tobacco or a multi-layered dessert, a higher PG ratio is beneficial. VG tends to mute flavors slightly due to its inherent sweetness and density.

2. Throat Hit

As mentioned, PG provides the "kick" at the back of the throat. If you find your vape feels "empty" or like you are just inhaling flavored air, increasing the PG content can provide that missing physical satisfaction. Conversely, if your vape feels too scratchy or causes coughing, switching to a higher VG ratio will smoothen the experience.

3. Vapor Production

If your goal is to produce large, dense clouds, VG is the essential ingredient. High VG e-liquids create the visual density and "mouthfeel" that many modern vapers enjoy. PG produces very little visible vapor, making it the choice for "stealth vaping" where you don't want to draw attention to yourself.

4. Viscosity (Thickness)

This is the most important factor for hardware longevity.

• High Viscosity (VG): Requires more power and larger wicking ports.
• Low Viscosity (PG): Works best at lower wattages and in compact devices.

Common PG/VG Ratios and Who They Are For

At Vapor Authority, we carry a vast selection of US-made e-liquids with varying ratios. Here is how the most common blends perform in the real world:

50VG / 50PG

This is the classic "balanced" ratio. It provides a solid throat hit, clear flavor, and a moderate amount of vapor. It is the gold standard for nicotine salt e-liquids and is designed specifically for pod systems and mouth-to-lung (MTL) tanks. MTL vaping involves drawing vapor into the mouth first before inhaling it into the lungs, similar to how one might use a straw.

70VG / 30PG

Currently the most popular ratio for standard (freebase) e-liquids. This blend is optimized for sub-ohm tanks and rebuildable atomizers. It produces significant vapor clouds and a very smooth throat hit while still retaining enough PG to deliver bold flavor.

80VG / 20PG and "Max VG"

These ratios are for enthusiasts using high-wattage box mods and specialized sub-ohm equipment. "Max VG" does not mean 100% VG; it simply means the manufacturer added the maximum amount of VG possible while accounting for the PG that is usually present in the flavor concentrates and nicotine. These liquids are extremely thick and produce massive clouds but may lack the sharp flavor clarity of more balanced blends.

Hardware Compatibility: Matching Ratios to Coils

Using the wrong ratio for your hardware is the leading cause of coil failure.

Sub-Ohm Tanks and Box Mods

These devices are designed for Direct-to-Lung (DTL) vaping, where you inhale the vapor directly into your lungs. Because these devices run at higher wattages (30W to 100W+), they vaporize liquid very quickly. They require high-VG liquids (70%+) to prevent the tank from flooding and to provide a smooth inhale at high temperatures.

Pod Systems and Starter Kits

Most pod systems are designed for MTL vaping and use higher resistance coils (typically 0.8 ohms to 1.5 ohms). These devices do not produce much heat, so they need the thinner consistency of 50/50 VG/PG blends to keep the wick saturated. Using a 70VG or 80VG liquid in a small pod will almost certainly result in a burnt coil within a day or two.

Rebuildable Atomizers (RDA/RTA)

If you build your own coils, you have more flexibility. However, the same rules of physics apply. If your wicking is tight and your juice ports are small, stay closer to 60VG or 70VG. If you have a high-airflow RDA with plenty of room for cotton, you can easily run Max VG liquids for maximum cloud production.

PG Sensitivity and Allergies

While PG is generally recognized as safe for consumption and topical use, a small percentage of the population has a sensitivity or mild allergy to it. Symptoms of PG sensitivity can include an excessively sore throat, skin rashes, or persistent coughing even at low nicotine levels.

If you suspect you are sensitive to PG, you should look for "High VG" or "Max VG" e-liquids. By reducing the PG content to 20% or less, many vapers find that the irritation disappears. It is rare, but some manufacturers offer 100% VG liquids (using distilled water or VG-based flavorings) for those with severe sensitivities.

Nicotine Types and Their Relationship with PG/VG

The type of nicotine in your juice often dictates the PG/VG ratio you will find in the bottle.

Freebase Nicotine

Standard nicotine, often found in 3mg, 6mg, or 12mg strengths, is most commonly paired with a 70/30 VG/PG ratio. This is because freebase nicotine has a naturally harsher throat hit. The high VG content helps offset this harshness, making it palatable for DTL vaping.

Nicotine Salts

Nicotine salts are formulated to be smoother at much higher concentrations (25mg to 50mg). Because these are almost exclusively used in low-power pod devices, they are nearly always mixed at a 50/50 VG/PG ratio. The higher PG content ensures the thin liquid can wick properly in small devices, while the salt formulation prevents the throat hit from becoming overwhelming.

Battery Safety for High-Powered Vaping

When using high-VG liquids, you are often using box mods or devices that require external batteries, such as 18650 or 21700 cells. Safety is paramount when dealing with high-output devices.

Practical Battery Tips:

• Inspect Wraps: Never use a battery with a torn or peeling plastic wrap. The metal shell is the negative terminal, and any exposure can cause a short circuit.
• Use a Dedicated Charger: While many mods have USB ports, we recommend using an external "smart" charger to ensure even charging and to prolong battery life.
• Avoid Loose Batteries: Never carry loose batteries in your pocket or bag. If they touch keys or coins, they can vent. Always use a plastic battery case.
• Matched Sets: In dual-battery mods, use "married" pairs—batteries of the same brand and model that are always charged and used together.

Storage and Handling of E-Liquids

Regardless of the PG/VG ratio, all e-liquids should be handled with care.

1. Keep Away from Light and Heat: Both VG and PG can degrade when exposed to direct sunlight or high temperatures. This can darken the liquid and cause the nicotine to oxidize, resulting in a peppery or harsh taste. Store your bottles in a cool, dark cupboard.
2. Child and Pet Safety: Nicotine is toxic if swallowed. Always ensure your bottle caps are tightened and stored well out of reach of children and pets.
3. Shake Before Use: Over time, the ingredients in e-liquid can settle slightly. Give your bottle a quick shake before filling your tank to ensure an even distribution of VG, PG, flavor, and nicotine.

Conclusion

The balance between Vegetable Glycerin (VG) and Propylene Glycol (PG) is the "engine room" of your vaping experience. VG provides the smoothness and the clouds, while PG delivers the flavor and the throat hit. By matching your e-liquid ratio to your specific hardware—high VG for sub-ohm tanks and 50/50 blends for pod systems—you can avoid common issues like leaking and dry hits.

• Choose 70% VG or higher for large clouds, smooth hits, and sub-ohm devices.
• Choose a 50/50 ratio for bold flavor, satisfying throat hit, and pod systems or MTL tanks.
• Always check your coil’s wicking ports to see if they can handle thick or thin liquids.
• Store your liquid properly to maintain the integrity of the ingredients.

If you are looking for high-quality, US-made e-liquids in a variety of ratios, we invite you to browse our curated selection at Vape Juice & E-Liquid. We only carry authentic products tested by our team to ensure the best possible experience for our customers, and our About Us page explains how we handle products in-house.

FAQ

Can I use 100% VG e-liquid in a pod system?

No, we do not recommend using 100% or even 70% VG liquids in most pod systems. The liquid is too thick to pass through the small wicking ports quickly enough, which will result in the cotton burning and the coil failing prematurely. Stick to 50/50 ratios for these devices.

Why does my vape juice taste burnt even though the tank is full?

This usually happens because the VG content is too high for your coil, or you didn't "prime" the coil before use. If the liquid is too thick, the wick stays dry in the center, causing the heat to burn the cotton. Try a liquid with more PG or wait longer between puffs to allow the wick to saturate.

Does PG or VG affect the lifespan of my coils?

Yes. High VG liquids are thicker and often contain more sweeteners, which can "gunk up" a coil faster. High PG liquids are thinner and cleaner, often leading to a slightly longer coil life, provided the device is designed to handle thin liquids without leaking.

Is one safer than the other?

Both VG and PG are widely used in the food and medical industries and are generally recognized as safe for consumption. However, neither should be considered "healthy" or "harmless" when inhaled. Some people find PG more irritating to the throat, while others have no issues with either ingredient. Regardless of the ratio, vaping products are intended only for adult smokers.