That the tobacco is addictive is beyond all doubt. It is more, it is confirmed that although 7 of each 10 smokers want to leave it, to leave it is one of the most difficult tasks to those than they are possible to be faced throughout its life and, in fact, the realized investigations demonstrate that those leave who it only on the basis of the will force end up less than falling to eight days and only the 3 percent stays free of tobacco after a year. The cause by which it as much costs to stop smoking is very simple: between more than 3,000 toxic substances that a cigarette contains it emphasizes the nicotine, whose addictive power is so strong that it is resembled, and even surpasses, to the one of other drugs like the cocaine or the heroin. “The addiction to the nicotine is so intense that people who suffer serious diseases even continue smoking, still knowing that it harms to them enormously�, has explained doctor Fernando Espí, specialist in tobacco addiction.