The e-cig cartridge is composed of inhaler and e-smoking liquid container. E-smoking liquid is the diluted nicotine fluid ready for atomizing in the inhaler container. The cartridge contains about 1ml e-smoking liquid and 15mg nicotine.
When the smoking liquid in the container of the cartridge is less so that there is less smoke coming out, you can either change the cartridge or just add two or three drops of the smoking liquid on the container, and then you will enjoy the same feeling as a tobacco smoking again.