Sub ohm tanks are a part of the ecig that have extremely low resistance measuring less than one ohm. These products require more powerful batteries than their higher-resistance counterparts. Make sure you have all the proper equipment before smoking with a sub ohm tank to prevent possible dangers such as a fire or explosion. These tanks should only be used by experienced vapors and with batteries that can handle the extra strain. Smoking with this type of tank produces a large amount of vapor and often changes the flavor of your ejuice. Below you will find top brands that sell sub ohm tanks including Innokin, Kangertech and Aspire.