<Li> 2003: Seattle residents voted to make enforcement of cannabis laws the lowest priority . </Li> <Li> 2004: Oakland, California residents approved Measure Z, making private adult cannabis offenses the lowest possible priority for law enforcement, establishing a system to regulate, tax, and sell cannabis pending state legalization, and urging legalization on the state and national levels . </Li> <Li> 2005: Denver residents voted to legalize cannabis . </Li> <Li> 2006: San Francisco made enforcement of cannabis laws the lowest priority . The change was approved through a Board of Supervisors vote . </Li>

Colorado is first state to legalize recreational pot