What Is in a Vape? Vape Ingredients Explained

Vape liquid is not one universal formula. Ingredients vary by product, flavour, nicotine strength and manufacturer. In the UK, a typical vaping liquid may contain propylene glycol (PG), vegetable glycerine (VG), flavourings and, in many products, nicotine. Some formulations may also contain water or other permitted additives.

That distinction matters because terms such as “vape”, “e-liquid”, “pod” and “disposable vape” describe different products or formats, not a single standard recipe. The exact ingredients for a particular product should be checked on its packaging and the manufacturer’s product information.

What are the main ingredients in vape liquid?

UK government guidance on Vaping Products Duty describes vaping products as commonly containing glycerine (usually VG), glycol (usually PG), nicotine in many products, and flavourings or colourings in some formulations. PG and VG normally make up most of the liquid, but the precise ratio is product-specific.

Propylene glycol (PG)

Propylene glycol is a colourless liquid used in many e-liquids as a carrier for flavourings and other ingredients. In a vape formulation it also affects how the liquid flows through the device and contributes to the characteristics of the aerosol produced when the liquid is heated.

The fact that PG is used in food, medicines or other products does not mean that every route of exposure is equivalent. For vaping-related health questions, evidence about inhalation is more relevant than evidence about swallowing an ingredient.

Vegetable glycerine (VG)

Vegetable glycerine, also called glycerol, is another common base liquid. It is more viscous than PG and contributes to vapour production. E-liquid manufacturers can use different PG-to-VG ratios depending on the product and the type of device for which the liquid is designed.

A higher or lower VG content should not be treated as a general measure of safety or quality. It is mainly a formulation characteristic and should be considered together with the complete product specification.

Flavourings

Flavourings create the taste and aroma of an e-liquid. Tobacco, menthol, fruit and other flavour profiles can contain different combinations of flavouring substances. There is no single list of ingredients that applies to every flavour or every brand.

For nicotine-containing e-cigarettes and refill containers placed on the Great Britain market, manufacturers and importers must follow the Tobacco and Related Products Regulations and submit required product information through the MHRA notification system. The MHRA also publishes ingredient guidance for nicotine-containing liquids.

Nicotine

Some vape liquids contain nicotine and some do not. Nicotine is addictive, so the presence and stated concentration are important product information. UK nicotine-containing products are subject to specific regulatory requirements, including limits and notification rules.

If you are specifically comparing products without nicotine, Ezee also lists nicotine-free vape options. The purpose of that category is product selection; this article is only explaining ingredients.

Water and other additives

Some formulations may contain water or other additives. Their presence is not universal, and it is not accurate to assume that all vape liquids contain the same additional ingredients. Product-specific ingredient information is therefore more reliable than a generic ingredient list when you need to know what is in a particular vape.

Do disposable and reusable vapes contain different ingredients?

The device format and the liquid formulation are separate questions. A single-use vape historically combined a battery, liquid reservoir and heating element in one product. A reusable system keeps the rechargeable device while a compatible pod, cartridge or other refill component is replaced or refilled as designed. Either format may have used similar categories of e-liquid ingredients, although individual formulations differ.

Single-use vapes have been illegal to sell or supply in the UK since 1 June 2025. Reusable vapes can still be sold when they meet the applicable rules. Readers who reached this article through older disposable-vape searches can view Ezee’s reusable alternatives to single-use vapes for current product information.

Are vape ingredients safe to inhale?

An ingredient being permitted in another type of consumer product does not, by itself, establish that inhaling it is harmless. The NHS states states that vaping is not completely harmless and that non-smokers and people aged 17 and under should not vape. Current UK health guidance also distinguishes the risks of vaping from the substantially greater risks of smoking combustible cigarettes.

Health claims should therefore be based on current evidence and authoritative guidance rather than on whether individual ingredients are used in food or cosmetics.

How can I check the ingredients in a particular vape?

Check the packaging, leaflet and manufacturer’s product information for the exact product. For nicotine-containing vaping products in Great Britain, the MHRA is the competent authority for the notification scheme. If you have a health concern about a particular ingredient or a reaction after using a product, seek advice from an appropriate healthcare professional.