What are E-liquids Made From?

E-liquids are the essential component used in electronic cigarettes and vaping devices. They’re responsible for creating the vapour that users inhale, and their composition plays a significant role in both flavour and experience. But what are e-liquids made from?

This article offers an in-depth examination of the four primary ingredients in e-cigarettes, detailing what they are, their functions and how they interact to create the vaping experience, helping you to be better informed.

The Four Main Ingredients for E-Liquids

The majority of e-liquids are composed of four primary ingredients: propylene glycol (PG), vegetable glycerine (VG), flavourings and nicotine, although nicotine-free options also exist. Each of these plays a specific role in shaping the vaping experience.

Understanding each component individually is essential, as it explains both how e-liquids work and why different users choose specific formulations. 

Propylene Glycol (PG)

Propylene glycol (PG) is a colourless, odourless liquid commonly used in a wide range of everyday products, including food, cosmetics and medicines. In e-liquids, PG serves as one of the two main base ingredients, alongside vegetable glycerine. Its primary function is to carry the flavourings, ensuring that the taste of the e-liquid is strong and distinct throughout the vaping experience.

Additionally, compared to VG, PG has a thinner consistency, making it easier to handle and allowing it to wick effortlessly through the coils of vaping devices. It’s also the reason for that noticeable throat hit, which mimics the sensation of smoking traditional tobacco cigarettes. While PG is regarded as safe for ingestion, some individuals may experience mild sensitivities such as dry mouth or throat irritation. For this reason, e-liquids are available in various PG/VG ratios to suit individual preferences.

Vegetable Glycerine (VG)

Vegetable glycerine (VG) is a natural, plant-derived liquid that forms the second major base ingredient in e-liquids. It is thicker than PG and has a slightly sweet taste, which can subtly sweeten the flavour of an e-liquid. VG is commonly used in foods, skincare products, and pharmaceuticals due to its safe, non-toxic properties, as well as its ability to retain moisture, add smooth texture and act as a gentle solvent for other ingredients.

In the context of vaping, VG is added to contribute to a smoother inhale and for its ability to produce large, dense clouds of vapour. This ability to create thick vapour clouds has become a key attraction, particularly among younger demographics, and is widely known in vaping culture as ‘cloud chasing’. Many e-liquids balance VG with PG to create an optimal mix of flavour intensity, vapour density, and throat hit. Without vegetable glycerine, vaping would lack the voluminous clouds and smooth texture that many users transitioning from traditional tobacco smoking find pleasant.

Flavourings

Flavourings are an essential component of e-liquids, providing a wide variety of tastes that make vaping appealing to those who are trying to quit traditional tobacco smoking. These flavourings are typically the same type used in everyday products, such as confectionery, soft drinks and baked goods, and are regulated to ensure they are safe for consumption. In e-liquids, flavour extracts or synthetically produced molecules are dissolved in the PG/VG base.

Their role is to transform vaping from a purely functional habit into a personalised experience to encourage tobacco smokers to make the transition to a healthier alternative while also customising their experience. Without e-liquid flavours that can mimic the flavour of tobacco and menthol, along with a wide variety of fruity and sweet options, the transition away from tobacco cigarettes would be less appealing and more challenging for some to break the habit.

Nicotine

Nicotine is a naturally occurring compound found in tobacco plants and is primarily responsible for the addictive nature of traditional tobacco smoking. In e-liquids, nicotine is included to provide a similar effect to cigarettes, helping smokers transition away from traditional tobacco cigarettes.

It delivers a mild stimulant effect and enhances the throat hit, giving users the familiar sensation they expect when inhaling. Nicotine strength in e-liquids can vary, typically measured in milligrams per millilitre (mg/ml), allowing users to select a level that matches their previous smoking habits or gradually reduce their intake, often with the goal in mind to quit the addiction and habit altogether without the withdrawals.

By offering flexibility in strength and delivery, nicotine in e-liquids plays a vital role in supporting smokers who want a less harmful alternative while still satisfying their cravings.

Why are Some E-Liquid Ingredients Banned?

Despite the simplicity of e-liquid formulas, not all substances are safe for inhalation. This is why certain additives are banned or restricted in e-liquids. For example, diacetyl, a chemical once used in popcorn to give it that buttery flavour, was linked to a lung condition known as popcorn lung, and as a result, has since been prohibited in reputable e-liquids.

Similarly, oils and lipid-based substances, which are safe in food, can cause serious respiratory problems if inhaled. Regulators also restrict ingredients that may form harmful by-products when heated.

The purpose of these bans is to protect public health and ensure that vaping remains a safer alternative to smoking. That is why vaping products should always be purchased from trusted retailers, both online and offline, rather than from the black market.

Manufacturers are required to follow strict testing and labelling standards, ensuring that consumers know exactly what they are inhaling. Being aware of the banned substances in e-cigarettes can help with the choosing process and avoid potentially harmful products.

E-Liquid Safety Guide

Safety is one of the most important considerations when choosing e-liquids. High-quality e-liquids are manufactured to strict standards, utilising pharmaceutical-grade or food-grade ingredients that have undergone rigorous testing for purity.

Consumers should always purchase products from reputable brands that comply with regulatory guidelines, as this ensures the absence of harmful additives such as diacetyl or certain oils that can be dangerous when inhaled.

Proper storage is also essential, for e-liquids should be kept in cool, dark places and away from children and pets, since nicotine-containing liquids can be toxic if ingested in large amounts. Vapers should also pay attention to the PG/VG ratio to ensure it suits their health needs, especially if they have sensitivities to one of the bases.

Checking the label for ingredient transparency is another key step, as trustworthy manufacturers will provide clear information about what’s inside. It’s also essential to use e-liquids with devices designed for them, as improper use can lead to leaks, overheating or reduced safety. Staying informed and cautious minimises the risks and ensures a safer experience.