Where does the majority of illegal marijuana production take place in north america?

The majority of illegal marijuana production takes place in North America is on the Western Coasts of the United States and Canada.
Marijuana farmers grew 22.3 million pounds of marijuana in 2006 in America. Most marijuana is produced for local, in-state use. According to National Survey on Drug Use and health, California contains 13.25% of annual marijuana users in the United States. 

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