Cocaine:

2007/2008: "North America accounts for more than 40% of global cocaine consumption (the total is estimated at around 470 tons); whereas the 27 EU and four EFTA countries were responsible for more than a quarter of global cocaine consumption. These two regions comprise more than 80% of the value of the global cocaine market, estimated at US$88 billion in 2008."

Source:
The Globalization of Crime - A Transnational Organized Crime Threat Assessment (p. 81-105)
UNODC (2010)