Table of Contents

1. Introduction
2. The Core Bases: Propylene Glycol (PG) and Vegetable Glycerin (VG)
3. Flavorings: Creating the Experience
4. Nicotine: Options and Strengths
5. What is NOT in Quality Vape Juice
6. Hardware and Liquid Interaction
7. Storage and Handling of E-Liquid
8. Conclusion
9. FAQ

When you transition from traditional tobacco products to vaping, one of the first things you notice is the vast array of flavors and options available. However, beyond the labels and the scent of the vapor, many adult vapers want to understand exactly what they are inhaling. Knowing the components of your e-liquid is not just about curiosity; it is a practical necessity for choosing the right products for your specific device and personal preferences.

At Vapor Authority, we believe that transparency is essential for our customers. Since 2013, we have prioritized offering only US-made e-liquids that meet high quality standards. By understanding the four primary ingredients found in most e-liquids—Propylene Glycol (PG), Vegetable Glycerin (VG), flavorings, and nicotine—you can better navigate the market and find the setup that works best for you. This guide will break down each component, explaining its purpose, its characteristics, and how it affects your overall experience.

Introduction

Vape juice, also commonly referred to as e-liquid or e-juice, is the fluid responsible for creating both the visible vapor and the flavor in an electronic cigarette. While the industry has evolved significantly over the last decade, the core chemistry of e-liquid has remained remarkably consistent. Most liquids on the market today consist of just a few base ingredients that are widely used in the food and pharmaceutical industries. Understanding these ingredients helps you troubleshoot issues like "burnt hits" or a throat sensation that feels too harsh.

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.

If you want to browse a wide range of options after reading, start with our E-Liquid Collection.

The Core Bases: Propylene Glycol (PG) and Vegetable Glycerin (VG)

The foundation of every e-liquid is a mixture of two base liquids: Propylene Glycol (PG) and Vegetable Glycerin (VG). These are known as "diluents" because they dilute the concentrated nicotine and flavorings to a level that is manageable for vaporization. Most bottles of juice will list a ratio, such as 70/30 or 50/50, which refers to the percentage of VG versus PG.

Propylene Glycol (PG)

Propylene Glycol is an organic compound that is colorless and nearly odorless. It has a low viscosity, meaning it is a thin, watery liquid. In the context of vaping, PG serves three primary functions:

1. Flavor Carriage: PG is an excellent solvent, which makes it the primary carrier for flavorings. It binds well with the concentrated flavor extracts, ensuring that the taste remains consistent from the first puff to the last.
2. Throat Hit: PG provides the "throat hit"—that slight tingling or raspy sensation in the back of the throat that many adult vapers look for.
3. Wicking Efficiency: Because it is thin, PG is absorbed quickly by the cotton wick inside your atomizer. This makes it ideal for smaller devices with tiny wicking ports.

Propylene Glycol is used in many everyday items, including food coloring, vanilla extract, and various medicines. However, some individuals may find that a high-PG liquid is too harsh on their throat, or in rare cases, they may have a sensitivity to it.

Vegetable Glycerin (VG)

Vegetable Glycerin is a natural chemical derived from vegetable oils, typically palm, soy, or coconut. Unlike PG, VG is very thick and viscous, with a consistency similar to syrup. It also has a slightly sweet natural taste. Its roles in e-liquid include:

1. Vapor Production: VG is responsible for the thick, white clouds associated with vaping. The more VG in a liquid, the denser the vapor will be.
2. Smoothness: VG is much smoother on the throat than PG. High-VG liquids (often 70% or higher) are preferred by vapers who use high-wattage devices and want to avoid a sharp throat hit.
3. Sweetness: Because it is naturally sweet, it can enhance dessert and fruit flavor profiles, though it can sometimes slightly mute the complexity of the added flavorings compared to PG.

Understanding the Ratios

The ratio of PG to VG determines how the liquid will perform in your device.

• 50/50 Ratios: These are common in nicotine salts and liquids designed for small pod systems. They provide a balanced throat hit and are thin enough to wick quickly in low-power devices.
• 70/30 Ratios (High VG): These are the standard for sub-ohm vaping. A sub-ohm tank uses a coil with a resistance below 1.0 ohms and requires a thicker liquid to prevent leaking and to produce large vapor clouds.
• Max VG: Some liquids contain 80% or even 90% VG. These are primarily used by "cloud chasers" using rebuildable atomizers, as the thickness can be too much for standard tanks to handle, often leading to "dry hits" where the cotton burns because the liquid cannot soak in fast enough.

For low-resistance setups, you can also look at dedicated Nicotine Salt E-Liquids.

Flavorings: Creating the Experience

Flavoring is perhaps the most complex part of what is in vape juice. While PG, VG, and nicotine are relatively straightforward, the flavor profile of a single e-liquid can be composed of dozens of different food-grade flavor concentrates.

At Vapor Authority, we only carry e-liquids manufactured in the USA. This is a critical distinction because US-made liquids are produced using food-grade and pharmaceutical-grade ingredients. The flavorings used in e-liquids are concentrated extracts that are generally recognized as safe for ingestion by food authorities, though their use in vaping is specific to the industry's standards.

Common Flavor Categories

The variety of flavors is one of the reasons adult vapers prefer these products over traditional options. Common categories include:

• Tobacco: Aimed at providing a familiar experience, these can range from dry, earthy notes to sweet, "RY4" styles that include caramel and vanilla.
• Menthol and Ice: Menthol provides a minty taste, while "Ice" flavors usually contain cooling agents like WS-23 that provide a cold sensation in the throat without a minty flavor.
• Fruit: These are among the most popular, featuring everything from single-note flavors like strawberry to complex tropical blends.
• Dessert and Pastry: These often use heavier flavor molecules to replicate the taste of custards, cakes, and cookies.

It is important to note that these flavorings are suspended in a base of PG. When you see "natural and artificial flavors" on a bottle, it refers to the complex mixture of aromatic compounds that create the specific taste profile.

If you are comparing popular options, our Best Sellers collection is a practical place to start.

Nicotine: Options and Strengths

Nicotine is the optional component in vape juice. While many vapers use nicotine, almost every flavor we carry at Vapor Authority is also available in a 0mg (nicotine-free) version. Nicotine used in e-liquid is typically extracted from tobacco plants and purified to USP (United States Pharmacopeia) standards.

There are two main types of nicotine used in e-liquids today: Freebase and Nicotine Salt.

Freebase Nicotine

Freebase nicotine was the industry standard for years. It is the purest form of nicotine and is highly alkaline.

• Characteristics: It provides a significant throat hit, which becomes more noticeable as the concentration increases.
• Strengths: Commonly found in 3mg, 6mg, and 12mg.
• Usage: Usually found in high-VG liquids meant for sub-ohm tanks. Because sub-ohm devices produce so much vapor, a lower concentration of nicotine (like 3mg or 6mg) is sufficient for most adult users.

Nicotine Salts

Nicotine salt (or Salt Nic) is a newer development that has changed how many people vape. It is created by adding an acid (usually benzoic acid) to freebase nicotine. This lowers the pH level, making the nicotine less alkaline.

• Characteristics: Because the pH is lower, it is much smoother on the throat, even at very high concentrations. It also enters the bloodstream slightly faster than freebase nicotine.
• Strengths: Commonly found in 25mg to 50mg.
• Usage: Nicotine salts should only be used in low-power pod systems. Using high-strength nicotine salt in a high-power sub-ohm device can result in an unpleasantly high intake of nicotine.

For a brand-specific option, take a look at I Love Salts E-Juice.

What is NOT in Quality Vape Juice

When discussing what is in vape juice, it is equally important to discuss what should not be there. In the early days of the industry, there were concerns about certain ingredients that have since been largely removed from reputable manufacturing processes.

1. Vitamin E Acetate: This is a thickening agent that was found in illicit, black-market THC cartridges. It is not, and has never been, an ingredient in commercial nicotine e-liquids sold by reputable retailers.
2. Oils: E-liquid is water-soluble. You should never use oil-based flavorings (like essential oils) in a vape, as inhaling vaporized oil can lead to serious respiratory issues.
3. Diacetyl: This is a flavoring compound once used to create "buttery" flavors. While it is safe to eat, the industry moved away from using it years ago due to concerns about inhalation. Most modern e-liquids are labeled as "Diacetyl-free."

By purchasing from established sources like us, you ensure that you are getting products that have been vetted and tested. We never sell clones or knockoffs, ensuring that the ingredient list on the bottle matches what is actually inside.

Hardware and Liquid Interaction

The ingredients in your juice directly affect the lifespan and performance of your hardware. This is a practical consideration that every vaper should keep in mind.

Coil Longevity and "Sweeteners"

Many high-end dessert and fruit liquids contain sweeteners like sucralose to enhance the taste. While these make the juice delicious, sucralose does not vaporize completely. Instead, it "caramelizes" on the coil, creating a black, gunk-like buildup. This eventually leads to a burnt taste, requiring you to replace your atomizer head or coil. If you find your coils are burning out in just a day or two, you might be using a liquid with a very high sweetener content.

Viscosity and Leaking

As mentioned earlier, the VG/PG ratio is vital.

• If you put a thin, high-PG liquid into a large sub-ohm tank, the liquid will likely seep through the cotton and leak out of the air intake holes.
• If you put a thick, high-VG liquid into a small pod system, the cotton won't be able to absorb it fast enough, leading to a "dry hit" where you inhale burnt cotton smoke.

If you use sub-ohm hardware, a dedicated SMOK TF Sub Ohm Tank is one example of a compatible product page.

Battery Safety and High-Power Devices

Since choosing the right juice often depends on whether you are using a high-power box mod or a small pod system, it is important to remember basic battery safety if your device uses external batteries (like 18650s).

• Inspect Wraps: Always check the plastic wrap on your batteries. If there is a tear or nick, do not use it.
• Use a Case: Never carry loose batteries in your pocket or bag. They can contact coins or keys, causing a short circuit. Always use a plastic battery case.
• Married Pairs: If your mod uses two batteries, keep them as a "married pair"—charge them together and use them together to ensure they drain and charge at the same rate.
• Correct Charging: Use a dedicated external charger rather than the USB port on the mod whenever possible to prolong battery life and ensure a balanced charge.

Storage and Handling of E-Liquid

Because of the ingredients involved, proper storage is necessary to maintain the flavor and potency of your e-liquid.

• Avoid Light and Heat: Both nicotine and flavorings are sensitive to light and heat. Exposure to the sun can cause the nicotine to oxidize, turning the liquid a dark brown or orange color and giving it a peppery taste. Heat can also cause the flavorings to break down.
• Cool and Dark: Store your bottles in a cool, dark place, like a cupboard or a drawer.
• Keep Out of Reach: Nicotine is toxic if swallowed or absorbed through the skin in high amounts. Always keep your e-liquid bottles away from children and pets. Most bottles come with child-resistant caps, but these are not "child-proof," so high shelves or locked cabinets are best.
• Steeping: Sometimes, a brand-new bottle of juice might taste a bit "chemical" or muted. This is because the ingredients haven't fully homogenized. "Steeping"—letting the bottle sit in a dark place for a week or two and shaking it daily—can often improve the flavor significantly.

If you want to explore more hardware built for thick liquids, the Uwell Sub Ohm Tanks collection is another useful reference.

Conclusion

Understanding what is in vape juice allows you to take control of your experience. Whether you prefer the sharp throat hit and intense flavor of a high-PG liquid or the smooth, dense clouds of a high-VG blend, the choice is yours. By sticking to high-quality, US-made liquids from trusted retailers like Vapor Authority, you can be confident in the authenticity and composition of your products.

Key Takeaways:

• PG (Propylene Glycol) provides flavor and throat hit, while VG (Vegetable Glycerin) provides vapor density and smoothness.
• Nicotine comes in freebase form (for sub-ohm) and salt form (for pod systems).
• Flavorings are food-grade concentrates; US-made liquids follow stricter quality standards.
• Ratios matter: Match your juice thickness to your device's capabilities to avoid leaking or burnt coils.

To learn more about our sourcing, shipping, and in-house fulfillment, visit our About Us page.

Ready to find your next favorite flavor? Explore our extensive collection of premium, US-made e-liquids and discover the perfect blend for your setup.

Shop the E-Liquid Collection at Vapor Authority

FAQ

Is there oil in vape juice? No, commercial nicotine e-liquids do not contain oils. The base ingredients, PG and VG, are water-soluble alcohols, and the flavorings are concentrates designed for inhalation. You should never add actual oils to a vape device, as this can be dangerous.

What does the 70/30 ratio on my bottle mean? The ratio refers to the balance between Vegetable Glycerin (VG) and Propylene Glycol (PG). A 70/30 ratio means the liquid is 70% VG and 30% PG, which is a standard thickness for sub-ohm tanks that produce large clouds.

Why did my clear vape juice turn brown? This is usually caused by nicotine oxidation. When nicotine is exposed to heat, light, or oxygen over time, it naturally changes color to a darker brown or amber. While it may slightly change the flavor, it is a normal chemical reaction.

Are there sugars in e-liquid flavorings? While e-liquids can taste very sweet, they do not contain actual sugar, which would burn and ruin a coil instantly. Instead, manufacturers use heat-stable sweeteners like sucralose to provide the sweet taste found in many dessert and fruit profiles.

If you want to compare current popular picks, check out New Arrivals and see what’s newly added.