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Verdampfer & Coils

Sub Ohm vaping: function, vaporiser & safety

Sub Ohm vaping explained: Vaporisers under 1 Ohm, suitable coils, performance and safety. All tips for dense clouds and intense flavour in the guide.

Sub-ohm refers to all vape coils with a resistance of less than 1 ohm and is synonymous with thick clouds of vapour, intense flavour and a noticeably warmer draw. Anyone switching from a classic pod system to a high-performance tank will find it hard to avoid the topic of sub-ohm vaping. At the same time, this technology places specific demands on the battery, e-liquid and settings. This guide explains how sub-ohm vaping works technically, which atomisers and coils are suitable, and what you should look out for in terms of purchase, performance and safety – without the myths, but with concrete figures from real-world experience.

Sub-ohm literally means ‘below 1 ohm’. The term refers to the electrical resistance of the heating coil in the atomiser. If this value is below 1.0 Ω, it is referred to as a sub-ohm atomiser. Typical values range between 0.15 Ω and 0.8 Ω.

According to Ohm’s law, lower resistance allows more current to flow, causing the coil to heat up faster and vaporise more e-liquid per puff. The required power is correspondingly higher: whilst an MTL (mouth-to-lung) coil manages with 10–15 watts, sub-ohm coils usually operate in the range of 25 to 80 watts.

Sub-ohm vaping should be distinguished from so-called MTL vaping, which involves a tight draw and resistances above 1 Ω. Sub-ohm vaping is almost always ‘Direct to Lung’ (DL): the vapour is inhaled directly into the lungs, similar to a hookah. The mouthpiece is wider, the airflow significantly more open, and the vapour volume increases noticeably.

A sub-ohm atomiser consists of a tank, a coil with wick (cotton) and an airflow system. The mod provides the necessary power, the coil heats the e-liquid to 200–250 °C, and the resulting vapour is drawn into the lungs through the open airflow.

Flavour and vapour production

Due to the high power, more e-liquid is vaporised per puff – around 3–8 mg instead of the 1–2 mg with MTL. Flavours come across as fuller and warmer as a result, with fruit blends and dessert notes benefiting particularly. E-liquid consumption increases accordingly: 5–15 ml per day is not uncommon with sub-ohm vaping.

Suitable e-liquids

For coils under 1 ohm, e-liquids with a high VG content (70/30 or 80/20 VG/PG) are suitable. High nicotine strengths are unsuitable – 3 mg/ml or less is sufficient, as a lot of vapour is produced per puff. Nicotine salt e-liquids with 20 mg are not suitable for sub-ohm vaping and can cause nausea.

  • Mod power: Choose a mod with at least 80 watts and a powerful 18650 or dual battery. Single batteries are often insufficient for coils under 0.3 Ω.
  • Match coil resistance to power: Each coil has a recommended wattage range (e.g. 0.4 Ω / 40–60 W). Stay within this range – too high a power setting will burn the cotton (dry hit).
  • Airflow adjustment: Sub-ohm vaping requires open airflow. If the airflow is too restricted, the vapour becomes uncomfortably hot.
  • Battery safety: Use only branded, pre-wound batteries with a suitable discharge current (at least 20–25 A). Damaged windings or scratches on the battery casing are a clear reason to discard the battery.
  • Priming: Allow new coils to soak in e-liquid for 5–10 minutes before taking the first puff. Otherwise, the cotton will burn immediately.

A common mistake is switching without adjusting the nicotine strength. Anyone switching from 18 mg MTL e-liquid to 18 mg sub-ohm e-liquid will be massively overdosing on nicotine. Reduce to 3 mg or less as soon as you’re vaping below 1 ohm.

Is sub-ohm vaping more dangerous than normal vaping?

Not necessarily, but the higher power output requires more knowledge about batteries and coils. With regulated mods and branded cells, the risk remains manageable. Mechanical mods without protection circuits are not suitable for beginners.

How long does a sub-ohm coil last?

Depending on the e-liquid, power and vaping behaviour, 5 to 14 days. Sweet flavours containing sugar significantly shorten the lifespan, as they caramelise the cotton. A burnt cotton taste is a clear sign that it’s time to change.

What nicotine strength is suitable for sub-ohm vaping?

A maximum of 3 mg/ml freebase nicotine. Many sub-ohm vapers use 0 mg or 1.5 mg, as each puff produces a much greater volume of vapour. Nicotine salts above 10 mg are expressly not recommended.

Can I vape sub-ohm with a pod system?

Some modern pod mods support coils up to 0.3 Ω and 40–50 watts. However, classic, compact pods with 1.0 Ω and a built-in battery under 1000 mAh are too weak for genuine sub-ohm vaping.

Sub-ohm vaping delivers intense flavour, dense clouds and a warm draw – but requires a setup comprising a suitable mod, the correct coil resistance and a low-nicotine e-liquid with a high VG content. By balancing these three factors, you’ll get the most out of both flavour and vapour production. Take your time to browse through our selection of sub-ohm vapes, compare the resistances of the suitable coils and pair them with an e-liquid that suits your vaping style.

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