"Legalization is more or less repeating the history of medical marijuana," said Ethan Nadelmann, executive director of the Drug Policy Alliance. "If you want to know which states are most likely to legalize marijuana, then look at the states that were the first to legalize medical marijuana."
A political arm of the alliance spent more than $1.6 million as one of the main funders of the Washington state campaign.
The passage of the ballot measures in Colorado and Washington state in November allowed personal possession of the drug for people 21 and older. That same age group will be allowed to buy the drug at special marijuana stores under rules set to be finalized next year.