Table of Contents
- Introduction
- The Foundation: Propylene Glycol (PG)
- The Cloud Maker: Vegetable Glycerin (VG)
- The Science of the PG/VG Ratio
- Flavorings: Creating the Profile
- Nicotine: Options and Strengths
- Other Potential Ingredients
- What Is Not in Your Vape Juice
- Proper Storage and Handling
- Matching Ingredients to Your Hardware
- Conclusion
- FAQ
Introduction
Choosing the right e-liquid is about more than just finding a flavor you enjoy. Understanding the main ingredients helps you match your liquid to your specific hardware for the best possible experience. At Vapor Authority, we prioritize transparency and education so you can navigate the vast world of e-liquids with complete confidence.
Most modern e-liquids consist of just four primary components that work together to create the vapor, flavor, and physical sensation of vaping. This article explores these ingredients in detail to help you understand how different ratios and formulations affect your daily routine.
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.
Every bottle of e-liquid we carry at Vapor Authority is manufactured in the United States using food-grade and pharmaceutical-grade ingredients. By understanding the roles of Propylene Glycol, Vegetable Glycerin, nicotine, and flavorings, you can better select products that suit your device and your personal preferences.
The Foundation: Propylene Glycol (PG)
Propylene Glycol, commonly referred to as PG, is one of the two primary "base" liquids used in vape juice. It is a synthetic organic compound that is colorless, nearly odorless, and possesses a low viscosity. In the context of vaping, PG serves several critical functions that define the character of the e-liquid.
Flavor Carriage and Clarity
PG is an excellent solvent and a superior carrier for flavor. It does not have a distinct taste of its own, which allows the intricate notes of complex flavor concentrates to shine through. Most flavorings used in the industry are actually suspended in a PG base before being mixed into the final product. If you prefer bright, sharp fruit flavors or distinct tobacco notes, a higher PG content often helps achieve that clarity.
Throat Hit and Sensation
For many adult vapers, the physical sensation in the throat is an important part of the experience. PG is responsible for providing this "throat hit." Because it is thinner and more acidic than its counterpart, Vegetable Glycerin, it creates a slight tingling or drying sensation when inhaled. This mimics the tactile experience that many former smokers look for when they transition to vaping products.
Viscosity and Device Compatibility
Propylene Glycol is a very thin liquid, similar to the consistency of water. This low viscosity is crucial for certain types of hardware. Small pod systems and older "clearomizers"—tanks that use small atomizer heads with tiny intake holes—rely on thin liquid to saturate the wick quickly. Atomizer heads are the replaceable components inside a tank that contain the heating coil and wicking material. If a liquid is too thick, these small coils cannot "wick" fast enough, which can lead to "dry hits" or burnt cotton. For those looking to refresh their setup, replacement atomizer coils are an important part of routine hardware maintenance.
The Cloud Maker: Vegetable Glycerin (VG)
Vegetable Glycerin, or VG, is the second half of the e-liquid base. Unlike PG, which is synthetic, VG is a natural chemical derived from plant oils, typically palm, soy, or coconut oil. It is a significantly thicker, more viscous liquid with a slightly sweet taste.
Vapor Production
If you have ever seen a vaper producing large, dense clouds of vapor, they are likely using a high-VG e-liquid. VG is much denser than PG. When heated by a coil, it turns into a thick, white mist. Vapers who prioritize "cloud chasing" or those who enjoy the visual aspect of vapor production generally opt for liquids with a higher percentage of Vegetable Glycerin.
Smoothness and Sweetness
Because VG is naturally sweet and has a thicker "mouthfeel," it tends to smooth out the overall vaping experience. It reduces the sharpness of the throat hit provided by PG and nicotine. For vapers using high-wattage box mods—devices with adjustable power levels—high VG content is often preferred to keep the inhale smooth and comfortable at higher temperatures. A tank like the UWell Valyrian IV Sub Ohm Tank is built to handle thicker liquids and higher-output setups.
Sub-Ohm Compatibility
Sub-ohm vaping involves using a coil with a resistance below 1.0 ohms. These setups usually run at higher wattages and have large wicking ports. Because VG is thick, it requires these larger ports to move into the coil effectively. Using a high-VG liquid in a low-power device might cause the coil to burn, but in a sub-ohm tank, it provides the necessary density to prevent leaking.
The Science of the PG/VG Ratio
Most e-liquids are not pure PG or pure VG. Instead, they are a blend of the two. The ratio of these two ingredients determines how the liquid performs in your specific device.
50/50 Blends
A 50/50 ratio is the standard for many nicotine salt e-liquids and starter kits. It provides a balanced experience: enough PG to deliver a noticeable throat hit and clear flavor, and enough VG to produce a satisfying amount of vapor. These liquids are thin enough to work in almost any device, especially low-output pod systems.
70/30 and High-VG Blends
A ratio of 70% VG and 30% PG is the most common choice for "freebase" nicotine e-liquids used in sub-ohm tanks. This blend is thick and produces significant vapor. While the flavor is still excellent, the throat hit is much smoother than a 50/50 blend. At Vapor Authority, we carry a wide range of these blends from top US manufacturers like Naked 100 and Coastal Clouds.
Max VG
"Max VG" does not mean 100% VG. It means the manufacturer has used the highest possible percentage of VG, using only enough PG to carry the flavor concentrates. These are typically 80% VG or higher. These liquids are very thick and are best suited for Rebuildable Dripping Atomizers (RDAs), where the user manually drips liquid onto the coils.
Flavorings: Creating the Profile
Flavorings are the most complex part of the e-liquid equation. While they usually make up only 10% to 15% of the total volume, they are responsible for the vast diversity of products available.
Food-Grade Concentrates
The flavorings used in vape juice are generally food-grade concentrates. These are the same types of flavorings used in candies, sodas, and baked goods. However, they must be specifically formulated for inhalation. Reputable manufacturers avoid using oil-based flavorings, as inhaling lipids can be dangerous. This is why we only stock US-made e-liquids that adhere to strict manufacturing standards and why Vapor Authority emphasizes the quality standards outlined on our About Us page.
Flavor Categories
The flavor possibilities are virtually endless. Common categories include:
- Tobacco: Aimed at providing a familiar, earthy taste.
- Fruit: Ranging from single flavors like strawberry to complex tropical blends.
- Menthol and Ice: Providing a cooling sensation on the inhale or exhale.
- Dessert: Rich profiles like custard, cheesecake, or glazed donuts.
- Candy and Sweets: Replicating popular gummy or hard candy tastes.
Each flavor profile interacts differently with the PG/VG base. For example, creamy dessert flavors often benefit from a higher VG ratio to enhance the "weight" of the flavor, while sharp citrus fruits often pop better in higher PG blends.
Nicotine: Options and Strengths
Nicotine is an optional ingredient in vape juice. Many enthusiasts choose 0mg (nicotine-free) liquids simply for the flavor and vapor production. For those who do choose nicotine, there are two primary types used in the industry.
Freebase Nicotine
Freebase nicotine was the industry standard for years. It is the purest form of nicotine and is highly alkaline. Because of this alkalinity, it becomes increasingly harsh on the throat as the concentration increases.
- Common Strengths: 0mg, 3mg, 6mg, 12mg, 18mg.
- Best For: Sub-ohm tanks and high-wattage devices. Most sub-ohm vapers use 3mg or 6mg to balance satisfaction with a smooth inhale.
Nicotine Salts
Nicotine salts, or "nic salts," are created by adding an acid (usually benzoic acid) to freebase nicotine. This lowers the pH level, making the nicotine much smoother to inhale at very high concentrations. This allows for higher nicotine strengths without the painful throat irritation that would occur with high-strength freebase liquid.
- Common Strengths: 25mg, 35mg, 50mg.
- Best For: Low-power pod systems. Nicotine salts are absorbed by the body more quickly than freebase nicotine, providing a different type of experience that many adult vapers prefer for daily use.
Other Potential Ingredients
While PG, VG, flavor, and nicotine are the "Main Four," you might occasionally see other ingredients listed.
Distilled Water
Some manufacturers add a very small amount of distilled water to their mixtures. This is usually done in "Max VG" liquids to slightly thin the consistency without adding more PG. This can help the thick liquid wick better in certain tanks. It is rare in modern formulations but still exists in some niche lines.
Sweeteners
Many modern e-liquids, especially those in the dessert and candy categories, use added sweeteners like sucralose. While this makes the flavor more "vibrant," it is important to note that heavy sweeteners can decrease the lifespan of your coils. The sweetener can caramelize on the heating element, creating a dark residue often called "coil gunk." If you find your coils are burning out quickly, you may want to try a liquid with less added sweetener.
What Is Not in Your Vape Juice
It is just as important to know what should not be in your e-liquid. High-quality, reputable brands—like those we vet and sell at Vapor Authority—do not contain certain harmful additives that have been associated with health concerns in the past.
- Vitamin E Acetate: This is a thickening agent sometimes found in illicit, black-market THC cartridges. It is never found in nicotine e-liquids from reputable manufacturers.
- Diacetyl: Some early e-liquids used diacetyl to create a buttery flavor. After concerns were raised about "popcorn lung" in industrial settings, the vast majority of the vaping industry transitioned to diacetyl-free flavorings.
- Oils and Lipids: E-liquids are water-soluble. Essential oils or vitamin oils should never be used in a vaporizer.
Proper Storage and Handling
Because e-liquid contains food-grade ingredients and nicotine, proper storage is essential to maintain its quality and ensure safety.
Keep Away from Light and Heat
Both nicotine and flavorings are sensitive to heat and ultraviolet (UV) light. Exposure to direct sunlight can cause nicotine to oxidize, which turns the liquid a dark brown or amber color and can give it a peppery taste. Heat can also cause the flavorings to break down, resulting in a muted or "off" flavor profile. For the best results, store your bottles in a cool, dark place like a cupboard or a drawer.
Safety First
Nicotine is a toxic substance if ingested or absorbed through the skin in high quantities. Always keep your e-liquid bottles tightly capped and stored well out of the reach of children and pets. Most modern bottles use child-resistant caps, but these are "resistant," not "proof." If you spill e-liquid on your skin, wash it off immediately with soap and water.
Shelf Life
Most e-liquids have a shelf life of approximately one to two years from the date of manufacture. You can usually find a "born on" date or an expiration date on the bottle. Over time, the ingredients will naturally begin to separate or degrade. If your liquid has significantly changed color, smells sour, or has become very thin, it is likely time to replace it.
Matching Ingredients to Your Hardware
To get the most out of the ingredients we have discussed, you must match them to the device you are using.
- For Pod Systems (e.g., SMOK Novo, Vaporesso XROS): Use 50/50 PG/VG ratios. These devices are designed for thinner liquids. Nicotine salts are the most popular choice here due to the low power output of these devices. If you are shopping for a modern refillable setup, the Vaporesso XROS 4 Pod Kit is a strong example.
- For Sub-Ohm Tanks (e.g., Uwell Valyrian, GeekVape Z): Use 70/30 or 80/20 VG/high-VG ratios. These tanks require thick liquid to prevent leaking and are built to handle the high heat required to vaporize VG. Low-strength freebase nicotine (3mg or 6mg) is ideal. A product like the SMOK Spirals Sub Ohm Tank fits this style of use.
- For Mouth-to-Lung (MTL) Tanks: These tanks have a tighter draw and use higher resistance coils. A 50/50 or 60/40 PG/VG ratio works best to ensure consistent wicking and a satisfying throat hit. For pod-style replacement hardware, SMOK Novo 3 Replacement Pods w/ Coil are a relevant option.
At Vapor Authority, we carry a massive selection of hardware and liquids to suit every possible combination. Whether you are looking for a high-VG dessert flavor for your box mod or a smooth nicotine salt for your pod system, understanding these ingredients is the first step toward a better experience.
Conclusion
Understanding what are the main ingredients in vape juice allows you to take control of your vaping experience. By choosing the right PG/VG ratio and nicotine type, you ensure that your hardware performs optimally and your flavor remains consistent.
- PG (Propylene Glycol) provides flavor clarity and a physical throat hit.
- VG (Vegetable Glycerin) is responsible for vapor density and a smooth inhale.
- Flavorings are food-grade concentrates that create the unique taste profiles we enjoy.
- Nicotine comes in freebase or salt forms, depending on your device and preference.
Ready to find your next favorite flavor? Explore our curated collection of US-made e-liquids at Vapor Authority and experience the difference that quality ingredients make.
FAQ
What is the difference between PG and VG?
Propylene Glycol (PG) is a thin liquid that carries flavor well and provides a "throat hit" similar to traditional smoking. Vegetable Glycerin (VG) is a thick, sweet liquid responsible for creating large vapor clouds and smoothing out the inhale. Most e-liquids use a blend of both to balance these characteristics.
Are there oils in vape juice?
No, reputable nicotine e-liquids do not contain oils. The ingredients are water-soluble, as inhaling oils (lipids) can lead to serious health issues like lipoid pneumonia. At Vapor Authority, we only sell e-liquids from established manufacturers that use appropriate food-grade flavorings intended for inhalation.
What kind of flavorings are used in e-liquid?
E-liquids use concentrated, food-grade flavorings similar to those found in the food and beverage industry. These are carefully blended by chemists to ensure they are stable when heated and safe for use in a vaporizer. These flavorings allow for the wide variety of fruit, dessert, and tobacco profiles available today.
Why are some vape juices thicker than others?
The thickness of a vape juice is determined by its VG (Vegetable Glycerin) content. Liquids with a high VG percentage (like 70% or 80%) are much thicker and are designed for high-power sub-ohm devices. Thinner liquids (like 50/50 blends) have more PG and are intended for smaller, low-power pod systems.
