(CNN) – The recreational use of marijuana officially became legal Monday in Colorado, a little more than a month after voters in the state passed an amendment in favor of the measure.
"Voters were loud and clear on Election Day," Gov. John Hickenlooper, a Democrat, said in a statement, as he signed an executive order to officially legalize the personal use and limited growing of marijuana for those 21 or older. Amendment 64, as it's called, is now a part of the state's constitution.
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It is still illegal, however, to buy or sell marijuana "in any quantity" in Colorado or to consume it in public.
Hickenlooper, who opposed the amendment in the run-up to Election Day, announced the start of a 24-member task force that would "begin working immediately" to help the state navigate federal laws and establish how citizens can legally purchase and sell cannabis.
Washington, the other state to pass the legalization of marijuana in November, officially made the practice legal last week. It could take a year, however, before rules are set for growing and selling pot.
Shortly after Colorado voters passed the amendment on November 6, Hickenlooper cautioned it was too soon to "break out the Cheetos," saying state authorities must work to implement the new measure and prevent individuals from being prosecuted by the federal government, which classifies marijuana as an illegal substance.
In a statement Monday, U.S. Attorney John Walsh said that the Department of Justice is "reviewing" the initiatives passed in both states and that the department's "responsibility to enforce the Controlled Substances Act remains unchanged."
"Regardless of any changes in state law, including the change that will go into effect on December 10 in Colorado, growing, selling or possessing any amount of marijuana remains illegal under federal law," Walsh said.
When Hickenlooper opposed the amendment, he warned that legal marijuana use could "increase the number of children using drugs" and would "detract from efforts to make Colorado the healthiest state in the nation."
"It sends the wrong message to kids that drugs are OK," he added in a statement.
However, with the amendment, Hickenlooper said he would work to enforce the law and make sure that Colorado operates in accordance with the federal government.
"As we move forward now with implementation of Amendment 64, we will try to maintain as much flexibility as possible to accommodate the federal government's position on the amendment," Hickenlooper said.
The task force holds its first public meeting on December 17 and must report its recommendations to the governor's office no later than February 28.
- CNN's Jim Spellman and Alan Duke contributed to this report.