Guide on E Liquids: Flavours, Strengths, and More

So, you’ve got your first vape, and now you're staring at shelves of vape e liquids wondering where to start. There might be a lot going on: different strengths, flavours, bottle sizes, and even rules about which juice works with which device.

Get it wrong, and you’ll end up with burnt coils or weak vapour. This guide sorts it for you. We’ll talk you through everything you need to know about e-liquids.

By Toby Jones

Published on June 06, 2025

What are E-Liquids?

Everyone is, to some extent, familiar with e-liquids, but what exactly is inside the vape juices?

E-liquids are specialised fluids used in e-cigs. Once packed in the vape devices, e-liquids are heated to create vapours and puffs that the user inhales. Vape juices come in numerous flavours, formulations, and nicotine strengths to meet the unique needs of diverse preferences.

What is in Vape Liquid?

Now, you may be wondering, “What is vape juice made of?”

E-liquids are formulated with four main ingredients. The consistency of vape juices depends on the ratio of these ingredients. Let’s take a closer look at the main components of e-liquids and how they impact your vaping experience:

Component #1: Vegetable Glycerin (VG)

Source: A natural liquid made from vegetable oils

Consistency: Thick texture

Vegetable Glycerin, or VG, is a natural liquid derived from vegetable oils, and it plays an important role in the texture and vapour production of e-juices. It is known for its thick consistency for creating dense clouds of vapour.

This is why VG is commonly used in sub-ohm coils and direct-to-lung (DTL) devices. The thicker nature of VG allows for a smoother throat hit compared to other base liquids. Additionally, VG helps to maintain a balance of flavour and ensures that the vape is not too harsh.

Many experienced vapers prefer VG-heavy e-liquids for their ability to create large clouds and smooth vaping experiences.

Component #2: Propylene Glycol (PG)

Source: A synthetic compound

Consistency: Thinner than VG

Propylene Glycol, or PG, is a synthetic compound that plays an important role in improving the flavour delivery of e-liquids. PG is much thinner than VG, which is why it’s ideally used for MTL (Mouth-to-Lung) vaping.

This makes PG the preferred choice for smokers transitioning to vaping. It is often used in a higher proportion in e-liquids designed for MTL devices, but the ratio of VG to PG can be adjusted based on personal preference.

Component #3: Nicotine (Optional)

Nicotine is the component that delivers the "hit" most smokers are familiar with. In vape liquids, nicotine is available in two primary forms: Freebase nicotine and nicotine salts.

Hybrid nicotine e-liquids, like Lychee Watermelon Riot Squad BAR EDTN 10ml Nic Salt E Liquid, combine freebase and nic salts, offering a smooth throat hit and lasting satisfaction. However, options are limited in flavour and nicotine strength since not many brands offer hybrids.

Vaping juices come in different nicotine variants, including 0mg/ml, 3mg/ml, 6mg/ml, 10mg/ml, 18mg/ml and 20mg/ml. Choosing nicotine strength is dependent on your personal preferences. To learn more about nicotine, check our guide on “The Right Amount of Nicotine in Your E-Liquid.”

Component #4: Flavourings

Flavourings are food-grade additives that give vape juices their distinct taste. It’s important to note that the right balance of flavouring can make or break an e-liquid’s appeal, and many vapers enjoy experimenting with different flavour combinations to find their ideal vape juice.

Some common flavour categories include:

Fruits: Strawberry, mango, watermelon, etc.
Desserts: Custard, chocolate, cake, etc.
Menthol/Mint: Cool mint and menthol blends.
Tobacco: Classic tobacco, menthol tobacco, etc.

Note: Vape juices come with specific ratios of VG and PG. To learn more about this, read our blog on “A Comprehensive Guide To PG And VG In E-liquids.”

How Many Types of E-Liquids Are There?

E-liquids come in various types. Below is an overview of the most common types of e-liquids.

Freebase Nicotine E-Liquids

Freebase nicotine e-liquids are the most common type. This makes them ideal for those looking to enjoy the sensation of smoking. The main features of freebase nicotine are:

What is freebase e liquid? It’s the purest and natural form of nicotine. They slowly dissolve into the bloodstream.
Throat Hit: Freebase nicotine offers a stronger throat hit.
Best For: Works well with sub-ohm devices and high-powered setups.
Nicotine Strength: It’s available in 3mg/ml, 6mg/ml, and sometimes 12mg/ml.

Nicotine Salts (Nic Salts)

Nicotine salts offer a smoother vaping experience and are characterised by these attributes:

What is it? Nic salts are formed when freebase nicotine is mixed with an acid. They are easily absorbed into the bloodstream.
Throat Hit: Provides a smoother throat hit.
Best For: Ideal for heavy smokers switching to vaping and those using pod systems.
Nicotine Strength: Available in higher strengths, typically 10mg/ml and 20mg/ml.

Shortfills

Shortfills are large bottles of nicotine-free e-liquids that leave room for nicotine shots. They are cost-effective and allow you to control the nicotine strength based on your preference. The key characteristics are:

What is it? A large bottle of nicotine-free e-liquid with space to add your nicotine shot.
Throat Hit: Customisable throat hit based on the nicotine shot you add.
Best For: Vapers who want to control their nicotine strength and enjoy larger volumes.
Nicotine Strength: No nicotine, but you can add nicotine shots to customise strength.

50/50 E-Liquids

Fifty-fifty e-liquids offer an even mix of VG (Vegetable Glycerin) and PG (Propylene Glycol). The main features are:

What is it? An equal blend of 50% VG and 50% PG.
Throat Hit: Balanced throat hit that’s satisfying but not too harsh.
Best For: Beginners using vape pens or refillable pod kits.
Nicotine Strength: Commonly available in 3mg/ml, 6mg/ml, 12mg/ml, and 18mg/ml.

What E-liquid Nicotine Strength Should You Use?

Choosing the right nicotine level in your e-liquid depends a lot on your vaping style and needs.

Heavy smokers: 18mg/ml to 20mg/ml – best for curbing cravings.
Moderate/casual vapers: 6mg/ml to 12mg/ml – a good middle ground.
Light vapers or those using high-powered devices: 0mg/ml to 3mg/ml – smoother and lower impact.

Remember, pod systems handle higher nicotine better, while bigger setups suit lower strengths. It’s all about finding the right balance that feels smooth and satisfying without being harsh. Try different levels to see what fits you best.

Vape Device Types and Coil Compatibility

When selecting an e-liquid, it’s really important to check whether your device’s coil is compatible with the e-juice or not. Here is how you can do that:

Understanding Coil Resistance and Its Impact on E-Liquids

Coil resistance, measured in ohms (Ω), determines how much power the coil requires to produce vapour. Have a look at this image for a better understanding:

As shown above, a vape coil draws e-liquid from the tank, undergoes heating, and ultimately becomes vapour. Remember, the lower the resistance, the more power the coil needs to operate, which results in larger vapour clouds.

Higher resistance coils require less power and are designed to provide a smoother, more controlled vapour.

The point is that the type of e-liquid you use will depend on:

Is your device designed for low-resistance coils?
Or, does it only support the high-resistance coils?

Once you know the answer to the above question, you can easily choose the right liquid for your device.

Best E-Liquid Types for Different Coil Resistances

Here is a guide to help you understand which e-liquid types are best suited for different coil resistances:

Below 1.0Ω

If your vape supports low resistance coils, like below 1.0 ohm, it’s designed for Restricted Direct-to-Lung (RDTL) and Direct-to-Lung (DTL) vaping. DTL vaping involves inhaling the vapour directly into the lungs in one smooth draw. For these coils, high VG e-liquids and freebase nicotine are the best choices. High VG liquids (typically 70% VG or higher) are thicker and produce larger clouds. This makes them suitable for sub-ohm devices that require more power. Freebase nicotine works well in these devices because it allows for a more intense throat hi

Above 1.0Ω

Coils with resistance above 1.0 ohms are generally used for Mouth-to-Lung (MTL) vaping. MTL vaping is just like smoking traditional cigarettes, where the vapour is drawn into the mouth before being inhaled into the lungs. E-liquids like nicotine salts and Fifty-Fifty liquids are ideal for these coils. Nicotine salts provide a smoother throat hit and are often used with higher nicotine strengths. 50 50 liquids offer a smooth and moderate vapour production with a balanced mix of PG and VG (50% VG/50% PG). Here is an overview:

Coil Resistance & E-Liquid Compatibility

Coil Resistance	Vaping Style	Best E-liquid Type	Device Type
Above 1.0 ohm	MTL (Mouth-to-Lung)	Nicotine salts, Fifty-Fifty liquids	Pods, Vape Pens
Below 1.0 ohm	DTL (Direct-to-Lung)	Freebase nicotine, High VG	Sub-ohm Mods

How Long Does Vape Juice Last?

Vape juice typically lasts up to two years when stored properly in a cool place. Over time, its flavour and nicotine strength may degrade, especially if exposed to light and heat. It's best to check the expiration date and inspect the juice for any colour changes.

Regarding how long a vape liquid bottle lasts? A 10ml bottle can refill a 2ml tank up to five times. And this bottle offers up to 3000 puffs. The 10ml bottle will last according to your usage frequency, the kind of device you’re using, and your vaping style.

Does Vape Juice Expire?

Yes, vape juice can expire. It has a lifespan of 1-2 years. Nicotine-free options can last for up to 2 years. However, if the bottle is opened, it’s better to use it within 3–6 months. Exposure to air, light, ultraviolet (UV) rays and heat can cause the nicotine to degrade. Always check the expiration date and the bottle for any signs of degradation. To get the most out of your vaping juice, store it in a cool and dry place.

Can You Take Vape Liquid On a Plane In the UK?

The answer to “Can you take vape juice on a plane?” is yes. But it must comply with the airline's liquid restrictions. Vape juice containers should not exceed 100ml, and all liquids must be placed in a resealable bag for security checks.

Some countries have additional rules if you’re travelling internationally, so it’s worth checking ahead. Also, make sure your vape pen or device is in your carry-on bag, as batteries aren’t allowed in checked luggage. With these steps, you’ll have no trouble taking your vape juice on your next flight.

What is an E-Liquid Calculator?

Most of us prefer refillable devices, and then we’re in charge of mixing our own juice and nicotine. No doubt, mixing your own e-liquid at home gives you the flexibility to customise nicotine strength, VG/PG ratio, and flavour profile according to your personal preferences. But getting the sweet spot at home is a real challenge.

This is where the e-liquid calculator comes in. E-liquid calculator offers correct measurements for each ingredient and helps make a DIY process that is precise and safe.

How to Use an E-Liquid Calculator?

Here's how you can get started on mixing your own e-liquids:

Step 1: Note Down the Concentrations

Before using an e-liquid calculator, you need to gather the following information about your desired e-liquid blend:

Total Volume: This is the amount of e-liquid you want to make. For example, if you want 100ml of e-liquid, this is your total volume.
Desired Nicotine Strength: This is the amount of nicotine you want in your e-liquid. It's usually measured in milligrams per millilitre (mg/ml). For instance, if you want a 6mg nicotine strength, note 6mg.
VG/PG Target Ratio: The VG (Vegetable Glycerin) and PG (Propylene Glycol) ratio affects the vapour production and throat hit. Common ratios include 70/30 (VG/PG) for cloud-chasing or 50/50 for a balanced experience.
Flavour Concentrate %: The flavouring will make up a percentage of the e-liquid. For example, a 10% flavour concentrate means that 10% of the total volume will be flavouring.

Step 2: Input the Information into the E-Liquid Calculator

Let's say, based on Step 1, you want to create:

Total Volume: 100ml
Nicotine Strength: 6mg/ml
VG/PG Ratio: 70/30
Flavour Percentage: 10%

Now, you can open an e-liquid calculator online and look for the following fields (the exact labels might vary slightly depending on the calculator):

Total Amount to Make (or Target Volume): Enter 100 here
Desired Nicotine Strength: You would enter 6 here.
Desired VG% %: You would enter 70 here.
Desired PG% %: You would enter 30 here.
Flavour Percentage (or Flavour Amount %): You would enter 10 here.

Once done, the calculator will automatically perform the calculation and show you how much of each of the components you need to create your desired e-liquid. The steps will then involve carefully mixing them according to the calculator's output.

Safety Tips for DIY E-Liquid Mixing

When making your own e-liquid, safety is of utmost importance. Here are some essential safety tips to keep in mind:

Wear Gloves: Nicotine is a powerful ingredient, so always wear gloves to avoid direct contact with your skin.
Use Clean Bottles: Ensure that all your mixing bottles are clean and clearly labelled to avoid contamination and mix-ups.
Mix in a Well-Ventilated Area: Make sure you're in a well-ventilated space to avoid inhaling any vapours from the nicotine or flavour concentrates.
Store Ingredients Safely: Keep all e-liquid ingredients in childproof containers, away from heat and direct sunlight. Nicotine should always be stored securely.

Final Words

Summing up, there is a range of e-liquids available in the market for every vaper. From intense throat-hit nicotine fluids to smooth freebase liquids, you can buy from a range of options that suit your preferences.

But don’t forget to consider the coil resistance and VG/PG ratios to ensure an amazing experience. Also, make sure to follow the e-liquid safety precautions to ensure they’re safe and out of the reach of children.

Ready to make your purchase? Check our catalogue to find your favourite e-liquid.

In short: focus on a rechargeable vape that feels comfortable, matches your smoking level, and keeps things simple. Whether it’s a small pod you can pocket or a pen-style vape pen, the best vape kit is the one you’ll actually carry and use.

Ever wondered how much nicotine is in a vape and how much is perfect for you? Many of our customers begin with a tried-and-true MTL pod kit and a 10–18mg nicotine salt. As you get used to vaping, you can tweak and try other styles. Remember – there’s no permanent commitment. If something doesn’t suit you, switch kit or nicotine, and see what clicks.

FAQS

Can I use salt nic in a sub-ohm device?

No. Nic salts are not recommended for sub-ohm devices because of their higher nicotine concentration and 50/50 PG/VG ratio. It’s best to use lower nicotine-strength liquids for such devices.

Why is my coil burning fast?

Using a liquid with low VG in a sub-ohm device, sweeter vape juice or chain vaping too fast can burn coils.

Which juice is best for a throat hit?

Choose a higher PG ratio for a stronger throat hit. These offer a traditional cigarette-like experience.

How do you add a nic shot to a shortfill?

To add a nic shot to a shortfill, first open the shortfill bottle. Then, pour the nic shot inside carefully. Give the bottle a good shake to mix everything up well. Let it sit for a little while, if you can; this helps the flavours blend better. After that, your juice is ready to use!

What is the difference between nic salt and e liquid?

Nic salts are a specialised form of e-liquids that are easy to inhale at higher nicotine strengths. In addition, they are absorbed faster into the bloodstream. On the other hand, e-liquids contain either nic salts or freebase nicotine. These provide a stronger throat hit.

How to open a vape juice bottle?

Grip the cap firmly and twist it counterclockwise. Some bottles have childproof caps that require pressing down before twisting. If the cap is stuck, try gently warming the bottle or using a cloth for a better grip.

Toby Jones - Vape Product Reviewer

Store Assistant & Content Writter

Toby Jones has been part of the Alectrofag team for over six years, combining his first-hand experience with vaping and a genuine passion for helping others along their journey. Having started vaping in 2016 to quit smoking, Toby quickly found himself working in the shop, where he’s shared countless stories and advice with customers over the years. Beyond the shop floor, he’s also put pen to paper, writing vaping guides with a personal touch that only comes from real experience. When he’s not offering advice or writing, Toby enjoys long beach walks, the occasional Piña Colada, and embracing life’s simple pleasures - because, as he likes to say, you can never get enough of the simple things.