Vape mods come in a variety of shapes and sizes, but all can be used to effectively transition from smoking to vaping. The differences in the various mods lie in their capabilities and can be used in variety of different applications. Most mods utilize the standard 510 thread -- though some may utilize proprietary connections -- meaning they will work with any tank that also features the same threads.
Mods are generally categorized between Fixed Voltage/Wattage Mods and Variable Voltage/Wattage Mods. Fixed Voltage offerings are generally easier to use and do not allow users to adjust any power settings. Variable Voltage mods do allow for power to be controlled but are often larger in size.