STR/AFP/Getty Images

Despite efforts to stem the global trade in narcotics—indeed, often because of them—new trade routes are emerging around the world, posing challenges to authorities and local populations alike. In this week's List, FP takes a look at the newest battlegrounds in the global war on drugs.

They include new transit points for cocaine bound for the United States and Europe, such as Venezuela and West Africa, new production locales for methamphetamines in Mexico, and a familiar foe that's using the heroin trade to regain a foothold in Afghanistan. All these new fronts are leaving a trail of addiction and violence in their wake. And all exemplify one of the most frustrating dilemmas of international counter-drug efforts: Just as one area seems safe from the cartels, another battle is always around the corner. Check it out.