E juice or the nicotine liquid used to refill cartridges has been around since the electronic cigarette but there are several reasons you might not want to refill your cartridges with it. Let's look at two major reasons why:

1. Possible overdose
2. Deterioration of quality

First and foremost, the use of the e juice cannot be measured 100% accurately by the user. Since this is the case, there is a real risk of overdosing and over stuffing the cartridge with juice. This can lead to inhaling or ingesting pure nicotine liquid. Cartridges come preloaded with the right amount of juice and are intended for one time usage.

The next reason and probably one people ignore is the deterioration of quality of the cartridge. Inside each cartridge is a fiber that holds the juice. This fiber comes into contact with the atomizer which heats the liquid and the fiber. Prolonged use of a cartridge can cause this fiber to put out a bad tasting vapor and can contaminate the juice.

To keep things safe, avoid refilling your cartridges if you can!