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Brain scientists are debating whether marijuana could be a useful treatment for post-traumatic stress disorder, NPR reports.

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Addiction treatment centers in Colorado are bracing for an increase in teens referred for marijuana use, ABC News reports. The state began legal sales of recreational marijuana for adults last week.

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Legal sales of recreational marijuana began in Colorado on Wednesday. Hundreds of state residents, as well as tourists from around the country, lined up before dawn to purchase state-regulated marijuana, The New York Times reports.

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The percentage of teens who think there is a great risk from being a regular marijuana user has dropped, according to a new survey. The Monitoring the Future survey found 39.5 percent of 12th graders think regular marijuana use is harmful, down from 44.1 percent last year.

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Heavy marijuana use in the teenage years could damage brain structures vital to memory and reasoning, a new study suggests.

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A bill to legalize, tax and regulate the sale of marijuana to adults in New York state was introduced this week by three state legislators.

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The Uruguay Senate has voted to legalize marijuana, The Wall Street Journal reports. The law, approved Tuesday, puts the government of the South American nation in control of the distribution and sale of marijuana.

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Pregnant women who smoke marijuana may increase their risk of stillbirth three-fold, a new study concludes.

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Employers in Colorado and Washington state, where recreational marijuana is now legal for adults, are wrestling with whether and how to adjust their drug policies to account for the new laws.

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A scientist at the University of New Haven is developing a new test to detect contaminants such as mold and mildew in marijuana, CBS News reports.

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