It is necessary to stress that electronic cigarettes seem to be a good method to give up smoking despite of disadvantages. However, it is important to apply electronic cigarettes in a proper way to achieve good results. There is information that one cartridge of electronic cigarettes may substitute twenty packs of traditional cigarettes. There are no recommendations as for the number of electronic cigarettes to use per day or week. One should just use this cigarette instead of traditional ones. So, it is enough to start with one cartridge and use it. Perhaps, you will not need the next one. The period of usage is different as every smoker applies different number of cigarettes. That is why it is impossible to plan the usage of electronic cigarettes for everybody.