The success of legalization initiatives in Colorado and Washington has sparked a new conversation in a nation that is one of the world's top marijuana growers: Should Mexico, which has suffered mightily in its war against the deadly drug cartels, follow the Western states' lead? Mexico's new president, Enrique Peña Nieto, opposes legalization, but he also told CNN that the news from Washington and Colorado "could bring us to rethinking the strategy."