The coil is an important part of your e-cigarette, because it has a big influence on the quality of the vape, for both taste en quantity. When you vape, the coil wears out and must be replaced when you notice a decrease of vape and taste. The resistance (Ω ohm) determines the quantity of vape and taste. How lower the resistance, the more vape but it wears more quickly. How higher te resistance, the more taste but lesser vape.