As of 2008, thirteen states have passed laws allowing the medicinal use of cannabis.
In most cases, the changes in state law were made through ballot initiatives – where voters can petition proposed law changes to be included on state and local ballots, allowing the public to vote for or against them.
Interestingly, where figures on such ballot initiatives are available, they show that laws in favour of medicinal cannabis laws are approved by more voters and receive a greater percentage of the vote than any successful Presidential candidate in recent memory!
Marijuana & Cannabis Blog 
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