Sub-ohm vaping means vaping with a coil whose resistance is below 1.0 ohm (Ω). Lower resistance lets the coil handle more power, so it heats more e-liquid on each puff and produces bigger, warmer vapor and a fuller flavor. In practice, a sub ohm vape is a tank and mod (or a pod mod) running a coil of roughly 0.15Ω to 0.4Ω at 26W or more, with wide-open airflow and a direct-to-lung draw.
This guide covers nicotine e-liquid devices for adults 21 and older. It explains what the term means, how sub-ohm vaping compares with standard vaping, what gear you need and which e-liquid works best.
What Is Sub-Ohm Vaping?
Every vape coil has an electrical resistance, measured in ohms. The lower the resistance, the more current flows through the coil at a given voltage, and the more power it can turn into heat. That is the whole idea behind sub-ohm vaping: a low-resistance coil, fed more power, vaporizes more e-liquid per second than a higher-resistance coil can. Our explainer on Ohm's law for vaping walks through the math.
Strictly speaking, any coil under 1.0Ω is sub-ohm, and that includes the 0.6Ω and 0.8Ω pods that ship with many pod kits. Those pods run at low power with a fairly tight draw, though, so most vapers don't call them sub-ohm. When people talk about sub-ohm vaping, they usually mean the low end of the range: coils around 0.4Ω and below, run at tens of watts on a device with an open airflow. VAPORESSO's GTi coils, for example, were developed for direct-to-lung vaping and come in 0.4Ω, 0.2Ω and 0.15Ω mesh versions.
Sub-ohm setups are built for a direct-to-lung (DTL) inhale, where you breathe the vapor straight into your lungs in one breath. If you're not sure which inhale style you use, our comparison of MTL and DTL vaping explains both.
Sub-Ohm vs. Standard Vaping: Key Differences
The table below compares three common coil ranges. Wattage figures come from VAPORESSO's GTX and GTi coil pages; other devices and coils will list their own ranges.
| Feature | Standard coil (1.0Ω and up) | Low-ohm pod coil (about 0.6–0.8Ω) | Sub-ohm coil (about 0.15–0.4Ω) |
|---|---|---|---|
| Typical power | Low: GTX 1.2Ω is rated 8–12W | Moderate: GTX 0.8Ω 12–16W, 0.6Ω 20–26W | High: GTX 0.2Ω 45–60W, GTi 0.2Ω 60–75W |
| Usual draw | Mouth-to-lung (MTL) | MTL or a slightly looser restricted draw | Direct-to-lung (DTL) |
| Airflow | Tight | Tight to medium | Open |
| Vapor | Small, discreet | Medium | Large, dense clouds |
| E-liquid use | Lowest | Moderate | Highest |
| E-liquid style | Thinner, balanced PG/VG; nic salt or freebase | Balanced PG/VG; nic salt or freebase | Higher VG; low-strength freebase |
| Typical device | Pod kits, pen-style vapes | Pod kits with adjustable airflow | Tank mods, pod mods with DTL pods |
Use the coil's own rating, printed on the coil or listed on its product page, rather than these ranges when you set your device.
How Resistance, Wattage and Airflow Work Together
Three settings shape a sub-ohm vape, and they only work well when they match.
- Coil resistance. Low-resistance coils usually have more heating surface, often mesh, so they can vaporize more liquid at once. They also need more power to get up to temperature.
- Wattage. On a regulated mod you set the power in watts and the chip works out the voltage. More power means more heat, more vapor and more flavor, up to the top of the coil's range. Above that, the wick can't keep up and you get dry, burnt hits. Our sub-ohm wattage guide covers how to find your setting.
- Airflow. A sub-ohm coil produces a lot of vapor, and an open airflow carries it away and keeps the coil from running too hot. Closing the airflow on a high-wattage coil tends to make the vapor hot and harsh.
Battery voltage used to be the third factor people talked about. On a regulated mod, the chip manages voltage for you. It only matters directly on unregulated mechanical mods, where the power depends on the battery's charge and the coil's resistance.
Why Vape Sub-Ohm? Pros and Cons
People switch to sub-ohm mostly for the vapor and the flavor. It also has trade-offs worth knowing before you buy.
Pros
- Bigger clouds. A low-resistance coil at high power produces far more vapor than a pod coil. This is what cloud chasers are after.
- Fuller flavor. More vapor per puff carries more flavor, and mesh coils heat evenly across their surface.
- Warmer, smoother draw. With an open airflow and a high-VG e-liquid, the vapor feels softer on a long inhale.
- More control. Tank mods let you change coils, wattage and airflow to suit each e-liquid.
Cons
- Higher running costs. Sub-ohm setups go through e-liquid faster, and coils need replacing more often when they run at high power.
- Bigger devices. Mods that power these coils need large batteries, so they are heavier and less discreet than pod kits.
- More to learn. You need to match coils, wattage and airflow, and, on mods that take removable batteries, know your battery's limits.
What Do You Need for Sub-Ohm Vaping?
A Mod with Enough Power
Low-resistance coils need a regulated mod that can deliver tens of watts. The VAPORESSO tank mod lineup is built for this. Two current examples:
- ARMOUR OCTA: runs on two 18650 batteries (sold separately) and goes up to 220W. The kit comes with the iTank T and GTi Dual Mesh coils in 0.2Ω and 0.4Ω.
- ARMOUR ULTRA: has a built-in 5500mAh battery and goes up to 100W, so there are no loose batteries to manage. It also ships with the iTank T.
A Sub-Ohm Tank
A sub-ohm tank holds the e-liquid and takes prebuilt low-resistance coils. The iTank T holds up to 6ml (2ml in TPD markets), fills from the top and has an adjustable top airflow. It takes all GTi mesh coils, rated at 50–60W for 0.4Ω, 60–75W for 0.2Ω and 75–90W for 0.15Ω. VAPORESSO's SKRR-S tank and NRG-S tank work the same way with their own QF and GT coils.
Some pod mods also run sub-ohm coils. They use a DTL pod with a replaceable coil instead of a separate tank, which keeps the device smaller.
Rebuildable Atomizers (for Experienced Vapers)
Instead of prebuilt coils, rebuildable tank atomizers (RTAs) and dripping atomizers (RDAs) let you build and wick your own coils. They give you full control over resistance, but you have to check every build with an ohm meter and stay within your battery's current limit. Start with our guide to what an RDA vape is if you're curious, and stick with prebuilt coils until you're comfortable.
The Best E-Liquid for Sub-Ohm Vaping
Two things matter most: the PG/VG ratio and the nicotine type and strength.
- PG/VG ratio. Vegetable glycerin (VG) is thicker and makes denser vapor; propylene glycol (PG) is thinner and gives more throat hit. Sub-ohm coils have large wicking holes that can soak up thick liquid quickly, so higher-VG blends work well. VAPORESSO's GTX coil chart lists 40/60 to 30/70 PG/VG for its 0.15Ω–0.3Ω coils, compared with 50/50 to 40/60 for its mouth-to-lung coils.
- Nicotine. A sub-ohm setup turns much more e-liquid into vapor with each puff, so sub-ohm vapers generally use lower-strength freebase e-liquid. The same GTX chart doesn't recommend nic salts at all for its lowest-resistance coils. Our guide to vape nicotine levels explains the options.
For more on matching a liquid to your hardware, see choosing the right juice for your vape tank.
How to Start Sub-Ohm Vaping
- Prime the coil. Fill the tank and wait about 5 minutes so the cotton soaks through before the first puff.
- Start at the low end of the coil's wattage range and step up a few watts at a time until the flavor and vapor feel right.
- Open the airflow and take a slow, steady direct-to-lung inhale rather than a quick, sharp puff.
- Use a higher-VG, lower-nicotine e-liquid made for sub-ohm tanks.
- Check your batteries. If your mod takes removable batteries, use only the type the manual specifies and replace any with a torn wrap.
Before building coils or using removable batteries, read our sub-ohm safety tips.
Is Sub-Ohm Vaping Right for You?
Sub-ohm vaping suits you if you like long, open draws, want more vapor and flavor, and don't mind a larger device and refilling more often. If you prefer a tight draw, a small pocketable device and nic salt e-liquid, a mouth-to-lung pod kit will feel more natural. Plenty of vapers keep one of each.
FAQ
What Does Sub Ohm Mean in Vaping?
It means the coil's resistance is below 1.0 ohm. Low-resistance coils can take more power, so they produce more vapor and flavor than standard coils. The term usually refers to direct-to-lung setups using coils around 0.4Ω and below.
Is a 0.8 Ohm Coil Sub-Ohm?
Technically yes, since it's below 1.0Ω. In practice, 0.8Ω coils run at low power with a fairly tight draw and are mostly used for mouth-to-lung vaping. GTX 0.8Ω coils, for example, are rated for 12–16W.
What Wattage Should I Use for Sub-Ohm Vaping?
Use the range printed on your coil. VAPORESSO's sub-ohm coils, for example, range from 26–32W for the GTX 0.4Ω up to 75–90W for the GTi 0.15Ω. Start at the bottom of the range and work up.
Can You Use Nic Salts in a Sub-Ohm Tank?
Most sub-ohm setups aren't meant for nic salts. Nic salt e-liquids are made for low-power mouth-to-lung devices, and VAPORESSO's GTX coil chart doesn't recommend them for its lowest-resistance coils. Use a lower-strength freebase e-liquid instead.
Do Sub-Ohm Coils Burn Out Faster?
They often need replacing sooner because they run hotter and vaporize more liquid. Sweet e-liquids, high wattage and chain vaping all shorten coil life. Change the coil when the flavor fades or turns burnt.
