A sub-ohm tank (also known as a Direct Lung tank) generally comes with a box mod, or a mod with the ability to run at a higher wattage. They have larger drip tips, meaning that to use the device properly, your mouth needs to open wider. Sub Ohm tanks provide you with vast amounts of vapour and lots of flavour from the liquid you’re using. This type of vaping is designed to bypass your mouth and be taken straight back into the lungs as you’re inhaling. The difference between MTL (Mouth to Lung) and Sub Ohm is that with a Mouth to Lung device, you take the vapour into your mouth first, THEN take it back into your lungs before exhaling.