If you've just switched from cigarettes or you're trying to figure out what you're actually inhaling when you vape — this is where to start. E-liquid is the fluid that gets heated by your device and turned into vapour. That's the short version. The longer one involves a few ingredients worth understanding before you pick your next bottle.

 

What is e-liquid?

E-liquid — also called vape juice, e-juice or simply eliquid — is used in e-cigarettes and vape devices. It sits in a tank, pod or cartridge, gets heated by a coil, and produces the vapour you inhale. No combustion, no burning tobacco, no tar.

Every e-liquid is built on the same basic formula: a carrier base, flavouring, and optionally nicotine. The proportions of those ingredients change everything — the throat hit, the cloud size, the intensity of the flavour.

 

What does vape liquid contain?

Four possible ingredients — most e-liquids contain three or all four:

Propylene Glycol (PG) — a thin, odourless liquid that carries flavour effectively and produces the throat hit you might associate with cigarettes. It's also used in food colouring, asthma inhalers and theatrical fog machines. Generally well-tolerated, though a small number of people have sensitivity to it.

Vegetable Glycerine (VG) — thicker and slightly sweet, VG is responsible for vapour production. The more VG in the mix, the denser the cloud. It makes the liquid more viscous, which is why high-VG liquids don't suit all devices.

Flavouring — food-grade concentrates that give e-liquids their taste. Fruit, menthol, tobacco, dessert — the range is wide. The flavouring makes up roughly 5–15% of the total liquid volume.

Nicotine — not always present. Available in two forms: freebase nicotine (the classic form, available in 3, 6, 12 or 18 mg/ml) and nicotine salts, which deliver nicotine more smoothly and faster, typically at 20 mg/ml. If you're buying a 0mg liquid, there's no nicotine at all.

The ratio of PG to VG is usually shown on the label — 50/50 is a balanced mix that suits most devices, while 70/30 VG/PG is aimed at sub-ohm kits and direct lung vaping.

 

What is vape juice used for?

Vape juice has one purpose: it's the consumable that makes a vape device work. Without e-liquid, there's nothing to heat and nothing to inhale. You refill your tank or pod with it, your coil heats it to around 180–210°C, and it turns into vapour.

For many people, e-liquid is part of switching away from cigarettes. The nicotine is there to manage cravings, while the act of inhaling mimics the physical habit of smoking. Others use 0mg liquids purely for the flavour and the vaping experience, with no nicotine involved.

 

What liquids can you vape?

Only e-liquids specifically formulated for vaping. This sounds obvious, but it's worth being clear about.

You cannot vape water, cooking oils, essential oils or any other household liquid in a standard vape device. These aren't designed to be heated and inhaled, and doing so can damage your device or cause serious harm. E-liquids are engineered to vaporise at the temperatures your coil produces — other liquids simply aren't.

In the UK and EU, nicotine-containing e-liquids are regulated under the Tobacco Products Directive (TPD). This means nicotine e-liquids can be sold in containers no larger than 10ml, with a maximum nicotine strength of 20 mg/ml. Nicotine-free liquids — like shortfills — aren't subject to the same volume restrictions.

 

Is vaping more harmful than smoking?

This question comes up often, and the honest answer is: current evidence suggests vaping is significantly less harmful than smoking cigarettes — but that doesn't mean it's risk-free.

Smoking involves combustion, which produces tar and carbon monoxide — two of the most damaging elements in cigarette smoke. Vaping doesn't burn anything. However, long-term studies are still limited, and inhaling any substance into the lungs carries some degree of risk. If you don't smoke, there's no evidence-based reason to start vaping.

If you're looking to explore what's available, the e-liquid range at DoctorVape covers a broad selection of flavours, nicotine strengths and PG/VG ratios — from 0mg options through to salt liquids at 20mg/ml.