The cartridge is a plastic small container. You can use your own nicotine solution as per your requirements. Vapor is created when the heating element passes liquid nicotine. You can choose from pre-filled or re-usable refill after the liquid is finished. Some manufacturers have recently launched customizers which combine cartridges and atomizers as one part. You can also use drips to fill the container. To make dripping easier, some electronic cigarettes have come up with cartridges made of stainless steel or plastic only for drips and not removing any materials out of the cartridges.

If you are planning to switch to an electronic cigarette you should be well-versed with the cartridge refill which you are going replace or purchase every now and then. So here is a guide to choose an appropriate refill cartridge for you.

-Taste: You have two options to choose from nicotine and non-nicotine. If you choose nicotine based you can get tobacco content from 0 to 18mgs.a smoker can choose as per his nicotine requirement and amongst the flavored ones are lemon, orange, strawberry, apple, pineapple, chocolate, mint etc.
-Nicotine requirement: nicotine content varies from no nicotine to about 18mg of nicotine
-Nicotine flavors: A seller can offer a wide range of cartridges which combine both nicotine and flavors.
-Health issues: poor quality cartridges can have leakages which will lead to contamination from other substances and certain harmful chemicals like carbon monoxide and addictives cause various health issues. Buy your cartridges after examining them carefully as it can lead to poor efficiency of the vaporization processes of the contents. It can even permanently damage your smoking device.
-Other details: one needs to be well-versed with the storability of nicotine and also nicotine in pure form can be fatal for a person's health. Disposability is another issue which should be taken care of.try to read the guidelines to dispose off these cartridges safely.

We have already seen tips to choose the perfect cartridge for your electronic cigarette, it's equally important to dispose it off safely after using it.
The following are the steps:
-Removing the used cartridge from the e-cigarette
-Rinsing well the cartridge to get rid of all the nicotine collected inside it. Preferably use an antibacterial.
-Make use of a tissue or paper or a foil to wrap it around the cartridge while throwing it.
-Throwing it away in a dustbin.

You can refill Cartridges using E-juice through drip method, by dropping the liquid in form of drops. The liquid must be dropped in till cartridge soaking is complete. Measuring the quantity will make sense as this can be helpful the next time you refill it. Try to fill the cartridge from beneath as it becomes comparative easier and there is no fear of liquid spilling. Don't overfill the cartridge; you may end up destroying the device.