What is sub-ohm vaping? It simply means to vape with an atomizer, such as the Innokin iSub Tank or iJoy Acme Vape, that has a coil with a resistance value of less than 1.0 ohms - hence the 'sub' as it stands for 'low'. The reason some advanced vapers “sub-ohm” is to increase the power output of fixed voltage devices like mechanical mods and non-variable regulated devices to create more vapor or flavor. Although it might sound simple it’s actually a complex and often controversial topic within the vaping community. The goal of this guide is to make sure you have accurate information so you can decide if sub-ohm vaping is right for you.

What is OHM?

Just as electrical current is measured in amps or length measured in metres, the measure of resistance of a coil is in ohms, sometimes seen as the symbol Ω. Most standard replacement heads for clearomisers are between 1.2Ω to 2.0Ω. The term ‘sub-ohm’ is used when the resistance of a coil measures less than 1 ohm.

eLiquid, Nicotine and sub-ohming.

When vaping using sub-ohm coils a substantial amount of vapor is produced compared to using coils above 1ohm on the same device. Typically sub-ohm vapers take lung hits meaning they inhale straight to their lungs increasing the vapor they can inhale each puff. Those who vape sub-ohm usually favor e-liquid with a higher percentage of vegetable glycerin than propylene glycol. The reason for this is that the vegetable glycerin creates larger clouds and denser vapor production. This is because VG has reduced throat hit compared to PG which helps to accommodate for the increased amount of vapor inhaled. Usually those vaping sub-ohm will also use lower nicotine strengths (typically 6mg/ml and under) compare to those vaping above 1ohm also because of the additional vapor produced and inhaled each pull.

 What difference does a sub-ohm coil make?

As the resistance of a coil gets less it allows more electrical current to flow. Higher current means more energy is getting to the coil, faster. This results in a coil heating up quicker and reaching a higher temperature.

Hotter coils lead to an increase in liquid being vaporised which, when combined with an increased airflow, increases the cloud produced and the flavour.