To the surprise of absolutely noboby.

Enforcing marijuana prohibition costs between $10 and $12 billion annually and has led to the arrest of nearly 18 million, more than the total number for all violent crimes combined, including murder, manslaughter, and rape, robbery and assault.

Think about it folks. If you are a prosecutor and want to move up the legal foodchain, it depends on the number of arrests and convictions you have, not what they have been convicted for. It is so easy to get the streetcorner drug dealer. They are in plain site, people know who they are, and they will be defended by someone from Legal Aid.

http://blog.wired.com/biotech/index.blog?entry_id=1559124