Voters in Colorado and Washington approved on Tuesday the recreational use of marijuana by adults, which marks a historic turn in vast disagreements about the acceptance of marijuana usage, according to NBC News.

Both Colorado and Washington had previously approved the medical use of marijuana and they are the first two states in America to legalize all uses of marijuana. The same initiative, which allows users over 21 to use the drug freely, was proposed in Oregon but did not gather enough votes to legalize it.

NBC noted that the new law legalizing the recreational use of marijuana could challenge some federal laws, especially since marijuana possession is still a federal crime. Supporters believe the new law will bring "new avenues of tax revenue" while opponents suggest that a rise in drug abuse and driving under the influence might occur.

Colorado Gov. John Hickenlooper said the state will make efforts to resolve any conflict between federal and state laws.

"The voters have spoken and we have to respect their will. This will be a complicated process, but we intend to follow through," he said. "That said, federal law still says marijuana is an illegal drug, so don't break out the Cheetos or Goldfish too quickly."

"It's probably going to pass, but it's still illegal on a federal basis. If we can't make it legal here because of federal laws, we certainly want to decriminialize it," he added.

The Drug Policy Alliance, a national advocacy group, said the that the new and approved law reflects growing national support for liberalized pot laws, according to USA Today. While speaking to Reuters, they cited a 2011 Gallup poll that showed 50 percent of Americans favoring the legalization of pot, while 46 percent were in opposition of such an initiative.