As U.S.-grown marijuana displaces Mexican cannabis in this country, drug traffickers are sending more cheap heroin and methamphetamine into the United States, according to The Washington Post.
The amount of marijuana seized by U.S. officers along the Mexican border has decreased 37 percent since 2011. In the past few years, American marijuana users have been choosing more potent, higher-grade varieties grown in the United States.
As the popularity of Mexican marijuana decreases, Mexican drug farmers are planting more opium poppies. The heroin these plants produce is being channeled to the U.S. communities hardest hit by prescription drug abuse, offering a cheaper alternative.