When need replace e-cigarette cartridge [2010-04-01]
When you begin to notice less amounts of vapor when you ¡°puff¡± your e-cigarette, this is a good indication the nicotine
cartridge is running low and will need to be replaced.
A cartridge is equivalent to roughly 10-30 tobacco cigarettes, depending on the model. So each cartridge is about half a pack to a pack and a half of traditional cigarettes.. E-cigarette review
When need replace e-cigarette cartridge 
