[President] Obama's first comments on the issue come weeks after Washington state and Colorado voters supported legalizing cannabis last month in ballot measures that stand in direct opposition of federal law.

"It does not make sense from a prioritization point of view for us to focus on recreational drug users in a state that has already said that under state law that's legal," he told ABC News in part of an interview released on Friday.

"At this point (in) Washington and Colorado, you've seen the voters speak on this issue. And, as it is, the federal government has a lot to do when it comes to criminal prosecutions," Obama said.

Marijuana remains an illegal drug under U.S. federal law, but Washington and Colorado on November 6 became the first states in the nation to make it legal for individuals to possess up to an ounce of marijuana for private use.

The Department of Justice has maintained that pot remains a federally controlled substance, and states have been looking for guidance from federal authorities on how they will handle the conflict with state laws.

Obama's comments do not mean that Justice Department officials have completed their review of the Colorado and Washington laws, a department spokeswoman said on Friday.

Asked whether Drug Enforcement Administration agents were arresting people for possessing pot in Colorado and Washington, spokeswoman Dawn Dearden said that the "DEA's focus has always been to disrupt and dismantle large-scale drug trafficking organization - not to arrest individual users."

Medical use of marijuana is legal in 18 U.S. states. But federal officials have still continued to crack down on some providers in those states.

Obama called the situation "a tough problem, because Congress has not yet changed the law." He told ABC that "what we're going to need to have is a conversation about" how to reconcile federal and state laws, and that he has asked U.S. Attorney General Eric Holder to examine the issue.

Holder has said the Justice Department is still considering its options but will act "relatively soon," possibly with a month.

"I think we will come up with a policy that will be respective of federal law but also will make sure we are effective in our fight against crime that truly has an impact on the American people," he said after a speech in Boston on Tuesday. He is scheduled to speak later on Friday at an event in Tulsa, Oklahoma.