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These data and subsequent analysis suggest that different trajectories of adolescent cannabis use are associated with distinct patterns of neural reward circuit function in early adulthood. Escalating marijuana use presents a higher risk for impaired motivation, including elevated depressive symptoms, anhedonia and poor educational attainment. It follows that alterations, perhaps the degradations of the reward circuitry, represent the mechanism by which cannabis users fail to attain their potential, resulting in both developmental and dose-dependent impairment in their higher-level functioning.
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"The False Dichotomy of Legalization and Criminalization"
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Study: You could fail a drug test from second hand marijuana smoke
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Schizophrenia Bulletin, sbx158
Published: 28 November 2017
Background
Cannabis use in young people is common and associated with psychiatric disorders. However, the prospective link between cannabis use and bipolar disorder symptoms has rarely been investigated. The study hypothesis was that adolescent cannabis use is associated with hypomania in early adulthood via several potential etiological pathways.
Results & Conclusions
Data were available on 3370 participants. Cannabis use at least 2–3 times weekly was associated with later hypomania (OR = 2.21, 95% CI = 1.49–3.28) after adjustment - Adolescent cannabis use may be an independent risk factor for future hypomania, and the nature of the association suggests a potential causal link. Cannabis use mediates the link between childhood abuse and future hypomania. As such it might be a useful target for indicated prevention of hypomania.
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Teens who use a lot of marijuana and alcohol are less likely to have a full-time job when they grow up, or to get a college education or get married, according to a new study by University of Connecticut researchers.
The study of 1,165 young adults from across the U.S. also found that dependence on pot and booze may also have a “more severe effect on young men” than on young women.
This study found that chronic marijuana use in adolescence was negatively associated with achieving important developmental milestones in young adulthood.
— Elizabeth Harari, University of Connecticut researcher
Young women who were dependent on marijuana and alcohol were also less likely to go to college and had a lower standard of living than nondependent women, but were equally likely to be employed full time and to get married as nondependent women.
“This study found that chronic marijuana use in adolescence was negatively associated with achieving important developmental milestones in young adulthood,” Elizabeth Harari, a UConn Health psychiatry resident and author of the study, told UConn Today.