One of the most commonly asked questions that is asked about Electronic Cigarettes is how long do they last? As with any electronic product, Electronic Cigarettes do have a life expectancy depending on their frequency of use. The Joyetech Ego-C provides the user plenty of vape and satisfaction but the atomizer will eventually need replacing. Cartomizer/Clearomizer units on the other hand, such as the CE4-V2 & CE5 provide superior vape but their life expectancy for a Heavy User is 2-3 weeks at best before they will need to be replaced. It is difficult for anyone to predict the length of time these products will last any given user.