A relatively new group, Project SAM, is warning the nation to brace itself for the terrible consequences of legal marijuana.

"We can look forward to more drugged driving accidents, more school drop-outs, and poorer health outcomes as a new Big Marijuana industry targeting kids and minorities emerges to fuel the flames," said former Congressman Patrick Kennedy, a co-founder of the organization.

The Justice Department announced Thursday that it would allow Colorado and Washington to move forward with the implementation of laws establishing state-regulated systems of marijuana production and distribution.

Federal authorities will only prosecute marijuana offenses in a limited number of circumstances, such as when marijuana is being sold to minors.

"This is disappointing, but it is only the first chapter in the long story about marijuana legalization in the U.S. In many ways, this will quicken the realization among people that more marijuana is never good for any community, which is what happened after the Ogden memo was issued in 2009," added Kevin Sabet, the co-founder and director of Project SAM.

Colorado and Washington are the only states to have legalized the recreational use of marijuana. Twenty states and the District of Columbia have legalized the medical use of marijuana.