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Supporters of Prop 19, a marijuana legalization initiative, rally on the steps of Oakland City hall in Oakland, November 2, 2010.(Brian van der Brug/Los Angeles Times via Getty Images)

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A student prepares a cigarette with tobacco and marijuana during a school trip, May 20, 2004. (Marco Di Lauro/Getty Images)

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(Tashatuvango/Shutterstock)

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A navy soldier salutes from the Dutch-made Sea Dragon submarine during a combat skills demonstration in the watersnear the Tsoying navy base in southern Kaohsiung on January 14, 2014. (SAM YEH/AFP/Getty Images)

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Presidential candidate Sen. Ted Cruz (R-TX) speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. (Scott Olson/Getty Images)

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Members of the Mexican Army carry boxes with heroin, cocaine and methamphetamine to be incinerated at a military base in Monterrey, Nuevo Leon state, on August 23, 2013. (Julio Cesar Aguilar/AFP/Getty Images)

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Presidential candidates John Kasich, Jeb Bush, Marco Rubio, Donald Trump, Ben Carson, Ted Cruz, Carly Fiorina, and Rand Paul at the GOP Presidential Debate, Milwaukee, Wisconsin, November 10, 2015. (Scott Olson/Getty Images)