ohm thingies need maintenance depending on your vaping habits, amount you vape, voltage/wattage vaped at, type of juice, etc. When vape production and taste deteriates, it's time to play with yur thingy. Some thingies can be cleaned, re-wicked, dry burned, to extend your thingy life. After time, all thingies must be replaced or rebuilt. There are many thingy life cycles. This is one of the things you'll intuitively come to understand as you become more familiar with your thingies, and what pleases your particular thingy.