The system consists of four filters, each to be used 7 to 14 days. The first filter eliminates up to 25% of nicotine and tars; the second up to 50%; the third up to 70%. By the fourth filter will be eliminating up to 90% of nicotine and tars. So, when finally put that pack of cigarettes down for the last time, can walk away with virtually none of the physical pains, mood swings and craving that have always made the cigarette habit so hard to break.