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Using marijuana at least once a week can lead to cognitive decline, poor attention and memory and decreased IQ in teens and young adults, according to researchers at the American Psychological Association annual meeting.

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A new ad campaign warns teenagers in Colorado about the long-term effects of marijuana use. The “Don’t Be a Lab Rat” campaign targets 12- to 15-year-olds, Reuters reports.

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Illegal marijuana operations are diverting precious water in California, The New York Times reports. The state announced a drought emergency in January.

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Many homeowners’ associations are dealing with conflicts among neighbors about marijuana use, in states where the drug is legal for medical or recreational use, the Associated Press reports.

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The four U.S. senators from Colorado and Washington state have asked the White House to establish “consistent and uniform” marijuana guidelines.

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As the use of drug courts expand, critics say people with minor marijuana infractions are more likely than those with serious drug problems to end up in these programs.

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Government researchers are studying the effect of marijuana on drivers, USA Today reports. The findings will help regulators decide on guidelines for drugged driving.

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The Oregon Secretary of State has certified that a petition campaign for a measure that would allow recreational marijuana for adults 21 and older has turned in enough valid signatures to qualify for the November ballot.

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The U.S. House on Wednesday rejected a measure that would have blocked the Treasury Department from implementing guidelines to make it easier for legal marijuana businesses to conduct banking.

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Marijuana use in Colorado has been much higher than expected, according to a new study by the state. While only about 9 percent of state residents use the drug, they are likely to use 121.4 metric tons of marijuana annually, The Washington Times reports.

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