This work analyzes the change in the agricultural patterns of Colombian peasants, in order of substitute commercial products by illegal crops, like poppy and others drugs. Also the essay remarks how besides the harvest of drugs the society produces social problems like prostitution and violent deaths. Thus in period mentioned a lot of violent actions have been made in the Colombian cities of Medellin, Bogota y Cali, all of them developed because nowadays drugs business has become in an activity that moves million of dollars in and out of Colombian borders. In the essays it’s mentioned some of this campaign against the lords of drugs, and the consequences of them