What Is Sub Ohm Vaping

ByJosh Douglas Published On Updated on
What Is Sub Ohm Vaping? UK Guide for Cloud Chasers | Dispergo Vaping
Advanced guide • Vaping FAQs

What Is Sub
Ohm Vaping

Vaping with a coil resistance below 1 ohm. Higher current, higher power, bigger clouds. Uses direct-lung inhale technique with 3mg/ml shortfill e-liquid. Built for experienced UK adult vapers who want bold flavour plus visible vapour. Not for beginners.

Read the FAQ Hub Jump to the Short Answer
Updated: April 2026
Written by: Josh Douglas, Dispergo CEO
For: Experienced UK adult vapers 18+
The short answer

Sub ohm vaping means using a device with a coil resistance below 1 ohm. Lower resistance draws more current from the battery, which produces more heat, more vapour plus more flavour. Sub ohm kits run at 40 watts or higher, use direct-to-lung inhale technique (one long pull straight to the lungs) plus pair with 3mg/ml shortfill e-liquid. The format produces large visible clouds plus bolder flavour. It is not recommended for beginners or ex-smokers in their first few months. Use of 10mg/ml or 20mg/ml nic salt in a sub ohm device is dangerous. The UK 2ml tank cap still applies. MHRA notification required on every sub ohm device sold in the UK.

The sub ohm numbers

Three numbers that define
UK sub ohm vaping

Resistance ceiling, power floor plus max strength pairing.

<1ohm

Coil resistance

The definition. Any coil with resistance below 1 ohm qualifies as sub ohm. Typical values 0.15 to 0.8 ohm.

40W+

Minimum power

Sub ohm kits typically run at 40 watts or higher. Mesh coils often run 60 to 100+ watts.

3mg/ml

Max strength

Sub ohm pairs only with 3mg/ml freebase shortfill or 0mg. Never use 10mg or 20mg nic salts.

The detailed answer

Sub ohm vaping explained in five parts for UK adult readers

Sub ohm is a technical term that describes a specific range of coil resistance. Everything else about sub ohm vaping (power, technique, e-liquid pairing, user experience) follows from that one chemistry fact. Five parts cover the complete picture.

Part 1: what sub ohm means technically

The “sub ohm” label comes from coil electrical resistance measured in ohms (Ω):

  • 1 ohm is the threshold. Anything below 1 ohm is sub ohm. Anything 1 ohm or above is MTL or standard resistance.
  • Ohm’s Law governs behaviour. Power (watts) = voltage squared divided by resistance. Lower resistance at the same voltage equals more power.
  • Typical sub ohm resistances. 0.15 to 0.8 ohm depending on coil design.
  • Mesh coils dominate the sub ohm market. Metal mesh heats faster plus more evenly than traditional wire wraps.
  • UK TPD approved sub ohm coils must pass MHRA notification for safety.

Part 2: how sub ohm devices work

Sub ohm kits differ from pod kits in several ways:

  • External batteries. Typically 18650, 20700 or 21700 lithium-ion cells. Often two in series for more power.
  • Variable wattage control. User sets the power output between minimum and maximum ratings for the coil.
  • Larger airflow. Wide-open airflow supports direct-lung draws.
  • Glass or steel tanks. Usually 2ml UK TPD compliant, although some pre-TPD tanks were 4ml to 6ml.
  • Sub ohm safe mode chipset. Modern kits check coil resistance on install and refuse unsafe combinations.

Part 3: e-liquid requirements

Sub ohm devices pair with a specific e-liquid profile:

  • High-VG ratios. Typically 70/30 VG/PG or 80/20 VG/PG for cloud production.
  • 3mg/ml or 0mg strength only. The vapour volume per draw means higher strengths deliver dangerous nicotine volumes.
  • Freebase nicotine. Nic salts are not suited to sub ohm use.
  • Sold as shortfills. 50ml, 100ml or 200ml 0mg bottles with separate 18mg nic shots for DIY mixing to 3mg/ml.
  • Flavour-forward profiles. Fruits, desserts, menthol plus tobacco all popular.

Part 4: the draw technique

Sub ohm requires direct-to-lung (DTL) technique:

  • Single long inhale. Draw vapour straight into the lungs. No mouth hold.
  • 3 to 5 seconds. Longer pull than MTL. Slower but deeper.
  • Wide open airflow. Almost no resistance. Feels like breathing through an open straw.
  • Exhale produces large cloud. Much more vapour than an MTL draw.
  • Different sensation to cigarettes. DTL does not recreate the smoking experience. Takes practice to enjoy.

Part 5: who sub ohm suits

Sub ohm suits a specific kind of UK adult vaper:

  • Experienced MTL users who want bigger flavour plus clouds.
  • Off-cigarettes 6+ months. Nicotine addiction stable before moving to lower strength.
  • Cloud chasing hobbyists. Users who enjoy the technical side of vaping.
  • Flavour-focused vapers. Sub ohm produces bolder flavour than pod kits.
  • Not for beginners. The technique, power settings plus battery safety learning curve is too steep.
  • Not for ex-smokers in first 3 months. Nicotine delivery is too slow to satisfy fresh cravings.
UK authority source check. The technical definition of sub ohm vaping reflects industry-standard usage in UK and international vaping literature. UK regulatory framework draws from the Tobacco and Related Products Regulations 2016 plus MHRA product notification requirements. The 2ml tank plus 10ml nicotine bottle caps apply equally to sub ohm equipment as to MTL pod kits. Dispergo Vaping stocks MHRA notified sub ohm coils, tanks plus batteries plus offers battery safety guidance in store.
Four sub ohm facts

Four facts UK vapers should
know about sub ohm

Higher power not higher nicotine

Sub ohm delivers more vapour so requires lower nicotine strength. Never confuse cloud size with nicotine hit.

Battery safety matters

External 18650 or 21700 cells need proper charging plus storage. Never mix cells. Replace any with damaged wrap.

Not for ex-smokers switching

MTL pod kits with 20mg/ml nic salt satisfy cravings better than sub ohm in the first 3 to 6 months off cigarettes.

Legal under UK TPD

All sub ohm equipment must be MHRA notified. 2ml tank cap plus 10ml nicotine bottle cap apply the same as MTL.

MTL vs sub ohm

MTL pod kit vs
sub ohm kit compared

Two different UK vape categories with different users, different e-liquid plus different experience.

MTL pod kit

Ex-smoker format

  • ✓
    Coil resistance. 1 to 1.6 ohm typical.
  • ✓
    Power. 10 to 20 watts.
  • ✓
    Inhale. Mouth to lung (like a cigarette).
  • ✓
    E-liquid. 10mg/ml or 20mg/ml nic salts.
  • ✓
    Cloud. Small discreet.
  • ✓
    User. Ex-smokers at any stage.
Sub ohm kit

Experienced vaper format

  • ✗
    Coil resistance. Below 1 ohm.
  • ✗
    Power. 40 to 100+ watts.
  • ✗
    Inhale. Direct to lung.
  • ✗
    E-liquid. 3mg/ml freebase shortfills only.
  • ✗
    Cloud. Large visible.
  • ✗
    User. Experienced UK adult vapers.

Sub ohm vaping is one UK vape format among several. For the full picture visit our vaping FAQs hub. Every major UK vape question sits inside.

Part of the hub

Back to the Vaping FAQs hub

This article sits inside our complete FAQs knowledge base. Head back to the hub for the full index covering MHRA rules, TPD, the 2025 disposable ban, the 2026 vape tax plus retailer compliance.

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Keep reading

More UK vape format basics

Sub ohm sits alongside MTL as the two main UK vape formats. Our technique breakdown on how to inhale a vape covers MTL plus DTL draws in detail. Our piece on what is nicotine salt explains why sub ohm users stick to freebase shortfills not nic salts. For the underlying UK design rules our guide on why UK vape products are limited to 2ml pods explains why even sub ohm tanks cap at 2ml.

FAQs

How to Inhale a Vape

Read article → FAQs

What Is Nicotine Salt

Read article → FAQs

Why UK Vape Products Are Limited to 2ml Pods

Read article →
Frequently asked

UK sub ohm vaping questions

What is sub ohm vaping?
Sub ohm vaping means using a device with a coil resistance below 1 ohm. Lower resistance draws more current from the battery, which produces more heat, more vapour plus more flavour. Sub ohm kits run at 40 watts or higher, use direct-to-lung inhale technique plus pair with 3mg/ml shortfill e-liquid. It is the high-cloud format for experienced adult vapers. Not recommended for beginners or ex-smokers starting out.
What strength e-liquid do you use for sub ohm?
3mg/ml or lower. High power plus direct-lung technique delivers much more vapour per draw than MTL pod kits. A 20mg/ml nic salt would deliver dangerous nicotine volumes in a single pull. UK sub ohm vapers almost exclusively use 3mg/ml freebase shortfills or 0mg flavoured shortfills. Never use 10mg/ml or 20mg/ml e-liquid in a sub ohm device.
Is sub ohm vaping safe?
For experienced adult vapers using UK TPD compliant equipment, sub ohm vaping is no more harmful than pod kit vaping at equivalent nicotine delivery. The main risks are battery safety (use quality external batteries and a proper charger) plus over-consumption of nicotine if users misuse high-strength e-liquid. Stick to 3mg/ml max, use the correct batteries, stay within wattage limits on the coil.
Who should use sub ohm vaping?
Experienced UK adult vapers who have already been using MTL pod kits and want bigger clouds plus bolder flavour. Not for beginners. Not for ex-smokers in the first few months of switching. Sub ohm draws can be harsh or overwhelming for users used to cigarette-style vapes. Transition to sub ohm over months not days once pod kit experience builds.
Is sub ohm vaping legal in the UK?
Yes. The UK 2016 TPD rules apply to sub ohm devices just as they do to pod kits. The 2ml tank capacity cap applies. The 10ml bottle cap for nicotine-containing e-liquid applies. Sub ohm shortfills at 50ml or 100ml are sold as 0mg flavoured shortfills with separate 18mg/ml nic shots for DIY mixing to 3mg/ml. All UK sub ohm equipment must pass MHRA notification.