BOSTON (AP) -- Having spent nearly three decades crusading for relaxed marijuana laws in Massachusetts, Bill Downing is greeting the state's new recreational marijuana law with a mix of satisfaction and trepidation.

The voter-approved measure took effect on Thursday, making it legal for adults to possess, grow and use limited amounts of pot.

"I am both celebrating and worrying that the law might not be implemented properly," said Downing, member liaison for the Massachusetts Cannabis Reform Coalition

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Bob Salsberg ~ Associated Press ~