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For the first time in more than 10 years, the percentage of positive drug tests among American workers has increased, according to a company that conducts the tests. The increase is fueled by a rise in use of marijuana and amphetamines, Quest Diagnostics found.

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Sales of recreational marijuana have surpassed sales of medical marijuana for the first time in Colorado, according to an analysis of state tax revenues. Whether recreational marijuana will become a profit center for the state remains in question, Time reports.

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Females may build up a tolerance to marijuana faster than males do, a new study of rodents suggests. People with an increased tolerance to drugs may be more likely to become addicted, The Huffington Post reports.

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Teens under age 17 who use marijuana every day are 60 percent less likely to graduate from high school, compared with their peers who have never used the drug, a new study finds.

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A new government report finds 9.4 percent of Americans ages 12 and older said they used illicit drugs in 2013. Almost 20 million said they used marijuana, according to HealthDay.

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A new study of teens treated at an outpatient substance abuse clinic found many showed symptoms of marijuana withdrawal.

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Some banks and credit unions are starting to do business with legal marijuana sellers, The Washington Post reports.

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Employers in Colorado are receiving mixed messages about how to deal with employees who use marijuana, according to NPR. Recreational use of marijuana is now legal for adults in both Colorado and Washington state.

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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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