Wick, Quartz & Ceramic Coil Options
The actual component that heats the e liquid and turns it to vapor is very important, and it is technically known as the coil or atomizer. Wick was the original material used, but now ceramic and quartz is becoming more popular for reasons such as better taste, however wick still remains popular too. In addition, the single coil was originally standard, but now more powerful options with two and even three coils exist to deliver huge vapor clouds.
OHM Resistance Levels
All atomizers including e liquid tanks have some sort of OHM rating which is a measure of its resistance to power. The higher the OHM, the more resistance the atomizer has, and the less power it will let through from the battery. Higher resistance usually offers a smoother vape experience as it less power is able to get through to the coil. Lower resistance allows power to flow through more easily and is often responsible for the huge vapor clouds you see.