Maintenance for Electric Cigarettes?

Are there any maintenance issues for electronic cigarettes, and if there are,  what might they be?

They’re very easy to use, and in general, the only maintenance required is to charge and replace the batteries as needed

Of course,, you also have to insert fresh cartridges or use some sort of refill liquid, but that’s it!

It’s recommended to keep the electric devices away from water – duh – and occasionally on some older models, you might need to reset the microelectronics in a device, by inserting the end of a paperclip into a reset hole on the side and holding for about 3 seconds.