First of all, let's clarify what Ohms are. An ohm is the measure of electrical resistance of the coil inside an atomizer or tank. It is normally shown using this symbol - Ω. The more wraps a coil has and the thinner said wire is, the higher the resistance and fewer, thicker wraps of wire tend to be a lower resistance. Any atomizer coil with a resistance bellow 1.00 ohms such as (0.50, 0.15, etc.) is a sub ohm coil.

DTL (Direct To Lung or most commonly known as Sub-Ohm) tanks are better used with VG-based E-Liquids, as they are much thicker than PG based liquids, and more intense than MTL. They are also best used with a lower nicotine strength, increasing the flavour production. Direct-To-Lung tanks use thicker e-liquids, like those comprised of 60% VG or higher percentages. This delivers a lower throat hit, as well as an enhanced flavour.

Nicotine Salt is a “newer” form of nicotine that has been finding its way into eliquid over the past few years. While Pure Base tends to be quite harsh, Nic Salt is much smoother on your throat while inhaled, and due to this, most Nic Salts E-Liquids contain a higher level of Nicotine. Also Nic Salts effect on your body is different; while Pure Base Nicotine gives you a slower and constant Nicotine dose, the first gives you a much faster Nicotine Rush, which your body assimilates at a quicker rate. So, if you are looking to stop smoking, and afraid of Nicotine craving while still wanting a smooth vape, Nic Salts should be your pick, but if you are looking for a harsher throat hit at a lower Nicotine dosage, sticking with Pure Base could be the better option.

Most coils can last up to  7-14 days, although that approximation depends on how often you vape, and your vaping habits. An important aspect is knowing the signs of needing to refill your tank, in order to avoid firing the device while there's no liquid, and consecutively burning the cotton of the coil. Two warning signs that you need to change your coil is a reduction in flavor production, and a lower amount of vapor emitted from your tank.