20 Nicotine refills for the mini electronic cigarette. Each refill or nicotine cartridge is approximately equivalent to 12 to 18 tobacco cigarettes depending on smoking habits. Please choose the level of nicotine you would like. The High level of nicotine is recommended for those who smoked cigarettes with no filter or heavy smokers, Medium is for those who are moderate smokers, Low is best to use as a reduction in nicotine intake leading up to the use of No-Nicotine cartridges with your mini electronic cigarette.