People participate in the so-called "Last demonstration with illegal marijuana" on their way to the Congress building in Montevideo, as Senate debates a government-sponsored bill establishing state regulation of the cultivation, distribution and consumption of marijuana during a session, December 10, 2013. The senate is expected to pass the law on Tuesday making the small South American nation the world's first to allow its citizens to grow, buy and smoke marijuana. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY CRIME LAW) 

People celebrate after the Senate approved a government-sponsored bill that provides for regulation of the cultivation, distribution and consumption of marijuana during a session in Montevideo December 10, 2013. Uruguay became the first country to legalize the growing, sale and smoking of marijuana on Tuesday, a pioneering social experiment that will be closely watched by other nations debating drug liberalization. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY) 

People participate in the so-called "Last demonstration with illegal marijuana" on their way to the Congress building in Montevideo, as Senate debates a government-sponsored bill establishing state regulation of the cultivation, distribution and consumption of marijuana during a session, December 10, 2013. The senate is expected to pass the law on Tuesday making the small South American nation the world's first to allow its citizens to grow, buy and smoke marijuana. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY CRIME LAW) 

People participate in the so-called "Last demonstration with illegal marijuana" in front of the Congress building in Montevideo, as Senate debates a government-sponsored bill establishing state regulation of the cultivation, distribution and consumption of marijuana during a session, December 10, 2013. Uruguay became the first country to legalize the growing, sale and smoking of marijuana on Tuesday, a pioneering social experiment that will be closely watched by other nations debating drug liberalization. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY CRIME LAW TPX IMAGES OF THE DAY) 

Uruguay's Senate debates a government-sponsored bill establishing state regulation of the cultivation, distribution and consumption of marijuana during a session in Montevideo December 10, 2013. The senate is expected to pass the law on Tuesday making the small South American nation the world's first to allow its citizens to grow, buy and smoke marijuana. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY) 

People participate in the so-called "Last demonstration with illegal marijuana" on their way to the Congress building in Montevideo, as Senate debates a government-sponsored bill establishing state regulation of the cultivation, distribution and consumption of marijuana during a session, December 10, 2013. The senate is expected to pass the law on Tuesday making the small South American nation the world's first to allow its citizens to grow, buy and smoke marijuana. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY CRIME LAW) 

People participate in the so-called "Last demonstration with illegal marijuana" on their way to the Congress building in Montevideo, as Senate debates a government-sponsored bill establishing state regulation of the cultivation, distribution and consumption of marijuana during a session, December 10, 2013. The senate is expected to pass the law on Tuesday making the small South American nation the world's first to allow its citizens to grow, buy and smoke marijuana. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY CRIME LAW) 

People participate in the so-called "Last demonstration with illegal marijuana" on their way to the Congress building in Montevideo, as Senate debates a government-sponsored bill establishing state regulation of the cultivation, distribution and consumption of marijuana during a session, December 10, 2013. The senate is expected to pass the law on Tuesday making the small South American nation the world's first to allow its citizens to grow, buy and smoke marijuana. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY CRIME LAW) 

Marijuana plants are seen in an indoor cultivation in Montevideo December 6, 2013. Uruguay's senate will vote on December 10 to create a government body to control the cultivation and sale of marijuana and allow residents to grow it at home or as part of smoking clubs. The use of marijuana is already legal in the South American nation, but sale and cultivation is not. The Senate is expected to vote on the measure, which is backed by leftist President Jose Mujica. Picture taken December 6, 2013. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY) 

Marijuana activist and indoor grower Juan Vaz inspects his indoor cultivation in Montevideo December 6, 2013 picture. Uruguay's senate will vote on December 10 to create a government body to control the cultivation and sale of marijuana and allow residents to grow it at home or as part of smoking clubs. The use of marijuana is already legal in the South American nation, but sale and cultivation is not. The Senate is expected to vote on the measure, which is backed by leftist President Jose Mujica. Picture taken December 6, 2013. REUTERS/Andres Stapff (URUGUAY - Tags: POLITICS DRUGS SOCIETY)