Table of Contents

1. The Foundation: Propylene Glycol (PG)
2. The Cloud Producer: Vegetable Glycerin (VG)
3. Balancing the Ratio: PG vs. VG
4. Flavor Concentrates: Creating the Profile
5. Nicotine: Freebase vs. Nicotine Salts
6. What is NOT in Quality Vape Juice?
7. Hardware Compatibility and Safety
8. Proper Storage of Your E-Liquid
9. Conclusion
10. FAQ

Adult vapers today are more informed than ever, and a common point of interest is understanding exactly what goes into e-liquid. Knowing the composition of your e-liquid is not just about curiosity; it is a practical necessity for tailoring your experience to your specific preferences. Whether you are looking for a stronger throat hit or massive cloud production, the secret lies in the base components and their specific ratios.

At Vapor Authority, we believe that transparency is the foundation of a great relationship with our customers. Since 2013, we have curated a selection of e-liquids that meet strict quality standards, ensuring that every bottle we ship from our San Diego headquarters contains only high-quality ingredients. This article provides a technical look at the four primary components found in modern e-juice and how they interact with your hardware to create the vapor you inhale.

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 Foundation: Propylene Glycol (PG)

Propylene Glycol, commonly referred to as PG, is one of the two primary base fluids used in e-liquid. It is a colorless, odorless liquid with a low viscosity, meaning it is relatively thin and flows easily. In the world of vaping, PG serves several critical functions that directly impact the user experience.

Flavor Carriage and Throat Hit

PG is an excellent solvent, which makes it the primary carrier for both nicotine and flavor concentrates. Because it does not have a strong inherent taste, it allows the complex notes of an e-liquid—whether it’s a robust tobacco or a sharp citrus—to come through clearly. Additionally, PG is responsible for the "throat hit" that many adult vapers look for. This is the slight tingling sensation in the back of the throat during inhalation, which mimics the tactile sensation of traditional combustible products.

Technical Properties of PG

From a technical standpoint, PG has a lower boiling point than its counterpart, Vegetable Glycerin. This means it requires less heat to turn into vapor. Because of its thin consistency, it is also highly effective at "wicking." Wicking refers to the process where the e-liquid travels from the tank reservoir into the cotton or ceramic material surrounding the heating coil. In smaller devices with tiny intake holes, a higher PG content is often necessary to prevent "dry hits," which occur when the wick cannot saturate fast enough to keep up with the heater.

Safety Standards and USP Grade

It is important to note that the PG used in the products we carry at Vapor Authority is USP Grade. This means it meets the standards set by the United States Pharmacopeia. USP Grade Propylene Glycol is used in a wide variety of common household items, including food products, cosmetics, and certain medications like asthma inhalers.

The Cloud Producer: Vegetable Glycerin (VG)

Vegetable Glycerin, or VG, is the second major component of the base mixture. Unlike PG, which is synthetic, VG is a natural substance typically derived from plant oils, such as soy, coconut, or palm oil. It is significantly thicker and more viscous than PG, resembling the consistency of syrup or honey.

Vapor Production and Smoothness

The primary role of VG is to produce the visible "clouds" of vapor. Because of its high density, it creates a much thicker, more voluminous vapor than PG alone. VG also has a naturally slightly sweet taste, which can add a subtle base note to dessert and fruit-flavored e-liquids. One of the most notable characteristics of VG is its smoothness. It provides very little throat hit, making it the preferred choice for vapers who use high-power devices and prefer a silky-smooth inhalation.

Impact on Hardware and Coils

Due to its thickness, VG can be harder on hardware. In devices with small atomizer heads (the component containing the heating coil), high-VG liquids may struggle to flow through the wick quickly enough. This is why high-VG liquids—often referred to as "Max VG" or 70/30 blends—are typically reserved for sub-ohm tanks. Sub-ohm vaping involves using a coil with a resistance of less than 1.0 ohm. These tanks feature large juice ports designed to accommodate thick liquids and high-wattage settings.

Balancing the Ratio: PG vs. VG

Understanding what are the ingredients of vape juice also requires understanding how these two base liquids are balanced. Most e-liquids are not pure PG or pure VG but a blend of both. The ratio you choose will define your entire vaping experience.

50/50 PG/VG Ratios

A 50/50 ratio is the standard for many pod systems and "mouth-to-lung" (MTL) devices. MTL is a style of vaping where you draw vapor into your mouth first, hold it for a second, and then inhale it into your lungs. This ratio provides a balance of flavor clarity, a noticeable throat hit, and a discreet amount of vapor. It is thin enough to work well with high-resistance coils (1.0 ohm and above) and lower power settings.

70/30 and 80/20 VG/PG Ratios

These ratios are designed for "direct-to-lung" (DTL) vaping. In this style, you inhale the vapor directly into your lungs in one smooth motion, similar to breathing through a straw. High-VG blends are thicker and produce much larger clouds. They are ideal for high-wattage box mods and sub-ohm tanks. While the throat hit is minimized, the vapor production is maximized. At Vapor Authority, we ensure that our product descriptions clearly list these ratios so you can match the liquid to your specific tank.

Flavor Concentrates: Creating the Profile

While PG and VG make up about 90% of the volume of a bottle of e-juice, the flavor concentrates are what make the experience enjoyable. These concentrates are food-grade flavorings, similar to those used in the food and beverage industry to create candies, sodas, and baked goods.

Complexity and Layering

Creating a high-quality e-liquid is a form of culinary art. A single "strawberry" flavor might actually contain five or six different strawberry concentrates to capture the sweetness, the tartness, and the "green" notes of a real berry. Manufacturers also use "enhancers" like ethyl maltol (for sweetness) or menthol (for cooling) to round out the profile.

Testing and Purity

Quality control is paramount when it comes to flavorings. The premium brands we carry at Vapor Authority manufacture their liquids in ISO-certified cleanrooms. This ensures that the flavoring concentrates are free from contaminants. In recent years, the industry has also moved away from certain ingredients like diacetyl, a compound once used to create buttery flavors. Modern premium e-liquids are tested to ensure these compounds are not present in the final product.

Nicotine: Freebase vs. Nicotine Salts

Nicotine is an optional ingredient in vape juice, though most adult vapers choose a strength that suits their needs. In the modern market, nicotine exists in two primary forms: freebase and nicotine salts.

Freebase Nicotine

Freebase nicotine has been the industry standard for years. It is "pure" nicotine and is very effective at being absorbed by the body. However, freebase nicotine has a high pH level, which makes it increasingly harsh as the concentration increases. For this reason, freebase liquids are typically sold in lower strengths like 3mg, 6mg, and 12mg. These are best used in sub-ohm tanks where the high volume of vapor compensates for the lower concentration.

Nicotine Salts

Nicotine salts (or Nic Salts) are a newer development. By adding a specific acid (usually benzoic acid) to the freebase nicotine, the pH level is lowered. This creates a much smoother inhalation, even at very high concentrations like 25mg or 50mg. Nic salts are absorbed more quickly into the bloodstream, providing a sensation more similar to traditional products. Because of the high concentration, nicotine salts should only be used in low-power pod systems and never in sub-ohm devices.

What is NOT in Quality Vape Juice?

Equally important to knowing what are the ingredients of vape juice is knowing what should not be there. At Vapor Authority, we only stock e-liquids manufactured in the USA using food-grade and pharmaceutical-grade ingredients.

Avoid "DIY" or Unregulated Sources

Premium e-liquids do not contain Vitamin E Acetate, essential oils, or any lipid-based (oil-based) flavorings. Inhaling oils can be extremely dangerous. This is why it is critical to purchase from a trusted retailer like us, rather than using homemade liquids or products from untrusted sources. Our team tests every line we carry to ensure it meets our standards for consistency and ingredient purity.

Hardware Compatibility and Safety

While this guide focuses on ingredients, the way those ingredients interact with your device is a matter of safety and performance. Using a high-nicotine salt liquid in a high-wattage box mod can lead to an unpleasantly high intake of nicotine. Similarly, using a thick 80/20 VG liquid in a small pod device will likely burn your coil instantly.

A Note on Battery Safety

For those using box mods or external battery devices to vaporize these liquids, battery safety is essential. Always use the correct charger for your device and inspect your battery wraps for any tears or nicks. If a battery wrap is damaged, do not use it; either re-wrap it or replace it. Never carry loose batteries in your pocket; always use a dedicated plastic battery case to prevent accidental short-circuits against keys or coins.

Proper Storage of Your E-Liquid

To maintain the integrity of the ingredients in your vape juice, proper storage is required. Over time, heat, light, and air can cause the nicotine to oxidize and the flavorings to degrade.

1. Keep it Cool: Store your bottles in a cool, dry place. Avoid leaving them in a hot car or near a window.
2. Keep it Dark: UV rays from the sun can break down nicotine and change the color of the liquid (often turning it a dark amber).
3. Keep it Sealed: Ensure the child-resistant caps are tightened fully when not in use to prevent unnecessary air exposure.
4. Keep Away from Pets and Children: Because of the nicotine content, e-liquids must always be stored out of reach of children and pets.

Conclusion

Understanding what are the ingredients of vape juice empowers you to make better choices for your hardware and your personal preferences. By recognizing the roles of Propylene Glycol, Vegetable Glycerin, flavorings, and nicotine, you can fine-tune your setup for the perfect balance of flavor and vapor.

• PG provides the flavor and throat hit; best for small devices.
• VG creates the clouds and smoothness; best for sub-ohm tanks.
• Nicotine Salts allow for higher concentrations in low-power devices.
• Quality Matters: Always choose US-made, USP-grade liquids from trusted retailers. For more background on the company behind the catalog, visit About Us.

Ready to find your next favorite flavor? Explore nicotine salt e-liquids and Get Salty E-Juice at Vapor Authority, where we ship a wide selection of premium, US-made e-liquids.

FAQ

Is there sugar in vape juice?

While some e-liquids taste very sweet, they do not contain actual sugar. The sweetness comes from the Vegetable Glycerin (VG) base and specific food-grade sweeteners like sucralose or ethyl maltol. These are used because actual sugar would caramelize, burn, and destroy the heating coil almost instantly.

Why does my vape juice turn dark over time?

E-liquid typically turns dark due to a natural process called oxidation. When nicotine is exposed to oxygen and light, it reacts and changes color, often turning from clear to yellow, orange, or deep brown. This does not necessarily mean the juice is bad, though it may indicate the flavor is beginning to degrade. If you want a matching setup for higher-PG or thicker blends, pod systems and sub-ohm tanks suit different ratios.

Can I mix two different vape juices together?

Yes, you can mix different e-liquids as long as they are compatible with your device. Many vapers mix flavors to create unique profiles or blend different nicotine strengths to reach a specific level. However, ensure you are not mixing a high-strength nicotine salt with a sub-ohm liquid if you plan to use it in a high-wattage device. A nicotine salt e-liquid is designed for low-output hardware rather than large sub-ohm setups.

Are all e-liquid flavorings the same as food flavorings?

While e-liquid flavorings are food-grade, they are specifically selected and formulated for inhalation. They are suspended in Propylene Glycol rather than oils or alcohol. It is dangerous to use standard grocery store food extracts in a vape device, as those may contain oils or sugars not intended for vaporization. For a compatible device, a box mod pairs better with high-VG liquid than a small pod system.