How is the vapour produced in an e-cigarette?

The process is similar in every e-cigarette, whether it’s a pod system, a disposable vape or a battery mod with a tank. From e-liquid to aerosol in three steps Wicking: A wicking material (usually cotton) draws e-liquid from the tank to the coil’s heating wire. Heating: When you take a puff, the battery activates and the coil reaches a temperature of around 180 to 250 °C, depending on the power setting. The e-liquid vaporises without burning. Condensation: The hot vapour meets cooler air in the chimney and condenses into fine vapour particles. This mixture of particles and air is the aerosol that you inhale. The density of the vapour cloud depends primarily on the VG content in the e-liquid, the wattage and the coil’s resistance. A sub-ohm coil (under 1.0 ohms) at 50–80 watts with a VG-heavy e-liquid (e.g. 70/30) produces dense clouds. An MTL coil (1.0–1.8 ohms) at 10–18 watts with a 50/50 e-liquid produces a more subtle aerosol that is closer to the draw of a traditional cigarette.

E-Zigaretten Grundlagen

E-cigarette aerosol: What's really in the vapour

Understanding e-cigarette aerosol: Composition, formation and difference to smoke. Incl. tips on devices, liquids and safe use from the age of 18.

E-cigarette aerosol is the visible vapour that you inhale and exhale when vaping – and, technically speaking, it is not smoke, but a finely atomised mixture of vaporised e-liquid and air. If you understand how this aerosol is formed and what it consists of, you can choose your device and e-liquid more carefully, avoid common mistakes when adjusting the power settings, and tailor your vaping experience to your preferences. In this guide, you’ll learn how a few drops of liquid turn into a dense mist, which vapour particles are involved, and what to look out for when buying an e-cigarette, coil and e-liquid.

In physics, an aerosol is a mixture of tiny liquid or solid particles suspended in a gas. In the case of vape aerosol, these are minute droplets of liquid floating in the inhaled air. Unlike cigarette smoke, there is no combustion process – there is no ember, no ash and no tar from charred plant material.

What you see as e-cigarette vapour consists mainly of four components of the e-liquid: propylene glycol (PG), vegetable glycerine (VG), flavourings and – if chosen – nicotine. PG provides the throat hit and carries the flavour, whilst VG produces the visible vapour cloud. The droplet size is typically in the range of a few micrometres, which is why the vapour aerosol appears lighter than smoke and dissipates more quickly into the air. Important: ‘more visible’ does not automatically mean ‘harmless’ – e-cigarettes are a product for adults aged 18 and over.

The process is similar in every e-cigarette, whether it’s a pod system, a disposable vape or a battery mod with a tank.

From e-liquid to aerosol in three steps

Wicking: A wicking material (usually cotton) draws e-liquid from the tank to the coil’s heating wire.
Heating: When you take a puff, the battery activates and the coil reaches a temperature of around 180 to 250 °C, depending on the power setting. The e-liquid vaporises without burning.
Condensation: The hot vapour meets cooler air in the chimney and condenses into fine vapour particles. This mixture of particles and air is the aerosol that you inhale.

The density of the vapour cloud depends primarily on the VG content in the e-liquid, the wattage and the coil’s resistance. A sub-ohm coil (under 1.0 ohms) at 50–80 watts with a VG-heavy e-liquid (e.g. 70/30) produces dense clouds. An MTL coil (1.0–1.8 ohms) at 10–18 watts with a 50/50 e-liquid produces a more subtle aerosol that is closer to the draw of a traditional cigarette.

The quality of the vapour depends entirely on the interplay between hardware and e-liquid. These points will help you make your choice:

Coil resistance suited to your vaping style: MTL (mouth-to-lung) for a tight draw and little vapour, DTL (direct-to-lung) for big clouds. A mismatch leads to a burnt taste or bland vapour.
Choose the VG/PG ratio carefully: High VG content (70%+) = more vapour, smoother draw. High PG content = more intense flavour and stronger throat hit.
Keep the power within the recommended range: Every coil has a wattage range (printed on the coil). Wattages that are too high will burn the cotton – this produces a harsh, dry-tasting aerosol (‘dry hit’).
Assess nicotine strength realistically: Sub-ohm setups with 12 mg/ml nicotine can quickly feel like an overdose after just a few puffs. For high-output devices, 3–6 mg/ml is suitable; for MTL pods, 10–20 mg/ml nicotine salt is standard.
Change coils and e-liquid regularly: Worn-out coils (usually after 1–3 weeks) significantly alter the flavour and vapour quality.

A common mistake: Beginners buy a high-performance kit with a sub-ohm coil and use it with a 50/50 e-liquid containing 18 mg of nicotine. The result is an unpleasantly harsh taste. Device, coil, e-liquid and nicotine strength should always be considered as a package.

Is vape vapour the same as water vapour?

No. Although the aerosol contains water, it consists mainly of vaporised PG, VG, flavourings and, where applicable, nicotine. The term ‘water vapour’ is therefore technically incorrect.

Why do I sometimes see less vapour than usual?

This is usually due to a low e-liquid level, a worn-out coil, a colder room or an e-liquid with a lower VG content. A weak battery also noticeably reduces the amount of vapour.

How long does e-cigarette vapour remain in the air?

Typical vapour particles dissipate within a few seconds to minutes – significantly faster than cigarette smoke, which clings to fabrics. Depending on the flavour, residual odours may nevertheless be noticeable for a short time.

Can I control the amount of aerosol myself?

Yes. You can directly control the amount of vapour via wattage, airflow, VG content and inhalation technique (inhaling longer and more evenly). A device with variable power gives you the most control.

E-cigarette aerosol is not smoke, but a condensed mixture of vaporised e-liquid and air. If you match the coil, wattage and e-liquid blend, you’ll get consistent flavour, clean vapour clouds and a smooth draw. If you’re just starting out or want to optimise your setup, it’s worth taking a look at our range of e-cigarettes, compatible coils and matched e-liquids – that way, you’ll find the combination that suits your vaping style.