What is Sub-Ohm Vaping? The Complete Guide

Sub-ohm vaping means using a vape coil with a resistance below 1.0 ohm (Ω). The term describes the resistance of the coil rather than a specific type of inhale, although sub-ohm setups are commonly associated with higher-powered devices, more open airflow and direct-to-lung (DTL) vaping.

Lower-resistance coils are often used in higher-powered vape kits designed to produce more vapour at higher power than traditional low-output setups, but resistance should not be considered on its own. Coil design, recommended wattage, airflow and the device itself all determine how a setup performs.

In this guide, we explain what sub-ohm vaping means, how sub-ohm devices work, the equipment and e-liquids commonly used with them, and what to consider when choosing a sub-ohm setup.

What Is Sub-Ohm Vaping?

Sub-ohm vaping uses a coil with an electrical resistance below 1.0 ohm (Ω). For example, a 0.8Ω, 0.4Ω or 0.2Ω coil is technically sub-ohm.

Resistance is only one part of how a coil performs. Many sub-ohm coils are designed to operate at higher wattages and with more airflow than higher-resistance coils, but the correct power level always depends on the specific coil and the manufacturer’s recommended wattage range.

Sub-ohm vaping is commonly associated with direct-to-lung (DTL) vaping because many higher-output devices use low-resistance coils and an open airflow. However, the two terms do not mean the same thing: sub-ohm describes coil resistance, while DTL describes how vapour is inhaled.

Why Do People Choose Sub-Ohm Vaping?

Sub-ohm vaping is usually chosen for a more open draw, higher vapour output and the ability to use higher-powered devices. Many sub-ohm setups are designed for direct-to-lung (DTL) vaping and use increased airflow to support a larger volume of vapour with each inhale.

Because these setups vaporise more e-liquid per puff, they are commonly paired with high-VG e-liquids and lower nicotine strengths than those typically used in lower-powered MTL devices.

The trade-off is higher e-liquid consumption and greater battery use, while the larger vapour output may also make sub-ohm devices less discreet in some situations. Whether those characteristics are an advantage depends on the type of vaping experience you prefer.

How Does Sub-Ohm Vaping Work?

A sub-ohm setup uses a coil with a resistance below 1.0Ω together with a compatible device that can operate within the coil’s recommended power range.

Many modern sub-ohm devices are regulated, meaning the device controls the power delivered to the coil rather than relying on the user to calculate the electrical output manually. The correct wattage still depends on the specific coil, so the manufacturer’s recommended range should always be followed.

Sub-ohm kits are commonly designed with more open airflow and are often used for DTL vaping, although the resistance of the coil and the style of inhale are separate characteristics.

If you are looking for a device built around this type of setup, you can compare our range of sub-ohm vape kits.

How Does Coil Resistance Affect Sub-Ohm Vaping?

Coil resistance is measured in ohms (Ω). A coil below 1.0Ω is classed as sub-ohm, but the resistance number alone does not tell you how much power the coil should use or how the device will perform.

Two coils with similar resistances can have different recommended wattage ranges because their design, materials and surface area may be different. For that reason, the manufacturer’s stated wattage range is more useful than trying to judge performance from resistance alone.

Lower-resistance coils are commonly found in higher-output setups, but a lower number should not be treated as automatically more powerful or better.

If you want a more in-depth explanation of how resistance relates to wattage and vaping style, see our guide to choosing the right coil resistance.

What Equipment Do I Need for Sub-Ohm Vaping?

A sub-ohm setup needs a compatible device, a coil below 1.0Ω and a tank or pod designed to operate safely within that coil’s recommended power range.

Many current sub-ohm vape kits combine the device and tank in one package, while some pod mods use low-resistance pods or replaceable coils to support higher-output vaping. Other setups pair a separate mod with a compatible sub-ohm tank.

The most important factor is compatibility. The device must support the coil or pod being used, and the power should remain within the manufacturer’s recommended wattage range.

Sub-Ohm Vape Safety

Sub-ohm vaping is straightforward with a compatible regulated device, but the coil, device and power settings still need to be used as the manufacturer intended.

Always use a coil or pod that is compatible with your device and stay within its recommended wattage range. A lower resistance does not mean you should simply increase the power: each coil is designed to operate within a specific range.

If your device has a built-in battery, use the charging method and cable recommended by the manufacturer and stop using the device if the battery or casing becomes damaged.

For devices with removable batteries, use the correct battery type and specification for the device, keep battery wraps intact and never use a cell that is damaged, dented or has a torn wrap. Loose batteries should also be carried and stored in a protective case rather than alongside metal objects such as keys or coins.

If you are unsure whether a coil, battery or power setting is compatible with your device, check the manufacturer’s instructions before using it.

What E-Liquid Should I Use for Sub-Ohm Vaping?

Sub-ohm devices are commonly used with higher-VG e-liquids because their thicker consistency suits many higher-powered coils with larger wicking ports and increased airflow.

A 70VG/30PG blend is a common choice for sub-ohm vaping, but the right PG/VG ratio depends on the specific coil and device. Some coils can handle thicker liquids better than others, so always check the manufacturer’s recommendations rather than assuming every sub-ohm setup needs the same blend.

Higher-VG e-liquids generally produce denser vapour and a softer throat hit than higher-PG blends, although flavour, vapour output and overall performance also depend on the coil, wattage, airflow and e-liquid formulation.

What Nicotine Strength Should You Use for Sub-Ohm Vaping?

Sub-ohm devices generally produce more vapour per puff than lower-powered MTL setups, so they are commonly used with lower nicotine strengths.

There is no single nicotine strength that suits every sub-ohm device. The appropriate strength depends on the device, coil, power level, e-liquid and how you vape, so avoid assuming that a particular resistance automatically requires a specific nicotine concentration.

If you are moving from a lower-powered device to a higher-output sub-ohm setup, you may need to reconsider the nicotine strength you normally use.

Our guide to choosing the right nicotine strength explains the different options in more detail.

Is Sub-Ohm Vaping Right For You?

Sub-ohm vaping may suit you if you prefer a more open draw, higher vapour output and a higher-powered setup. It is commonly associated with DTL vaping and higher-VG e-liquids, but the right setup still depends on the device, coil, airflow and e-liquid you choose.

If you prefer a tighter draw, lower vapour output or a lower-powered device, an MTL or RDL setup may be a better fit.

Whichever style you choose, use compatible coils or pods, follow the manufacturer’s recommended wattage range and choose an e-liquid suited to the device.