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NIDA Notes Articles: Marijuana

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Study Questions Role for Marijuana in Teen Users’ IQ Decline

August 2016
In a recent study, teens who used marijuana lost IQ points relative to their nonusing peers. However, the drug appeared not to be the culprit.

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Study Links Medical Marijuana Dispensaries to Reduced Mortality From Opioid Overdose

May 2016
Legally protected marijuana dispensaries (LMDs) were associated with lower rates of dependence on prescription opioids, and deaths due to opioid overdose, than would have been expected based on prior trends. However, LMDs also were associated with higher rates of recreational marijuana use and increased potency of illegal marijuana.

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THC Hampers Spatial Memory Development in Young Monkeys

September 2015
Adolescent monkeys that were exposed to THC fell progressively further behind THC-free monkeys in their ability to recall the location of an object after a brief delay.

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Animal Study Suggests Marijuana May Affect Future Offspring’s Susceptibility to Heroin

February 2015
Can marijuana use put offspring at heightened risk for opiate addiction, even if the use stops before the offspring are conceived? Results from a recent NIDA-funded study are consistent with other studies suggesting that a parent’s history of drug use, even preconception, may affect a child’s brain function and behavior.

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