Final answer:
The United States is the largest consumer of Latin America's opium poppy, with Colombian and Mexican cartels being key distributors to the US market.
Step-by-step explanation:
According to the information provided, North America, specifically the United States, is the largest consumer of Latin America's opium poppy. The Colombian drug cartels, with a Mexican distribution network, have captured a significant portion of the US heroin market. Furthermore, it has been mentioned that Mexican organized crime units have become the main traffickers of drugs, including heroin, into the United States, reflecting the large consumption in that region.