I used both for awhile but eventually was able to just do the vaping systems. I don't know what brand you are using, but if you think you'll be using e-cigs for a long duration you should do some research into the different types of systems out there. The self contained cartridges are usually made in China so I eventually stopped buying them and went to using American-made liquid and the tank systems (it's also cheaper than the cartridges because you can refill them and not throw them out then empty).

For anyone that's interested I used this site http://tasteyourjuice.com/wordpress/ to get up to speed on the different brands and options, and there are a lot of them out there!