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Differences between Combined, Isolated Use of Cannabis, Nicotine on Brain Networks

Close up of cannabis leaf in pink lighting.

Researchers at the Center for BrainHealth at The University of Texas at Dallas investigated the effects on the brain of concurrent cannabis and nicotine use, versus the use of solely cannabis and solely nicotine. The results, recently published in the journal Brain Structure and Function, show that not only were the effects in these three categories different, but also that the group using both nicotine and cannabis more closely resembled the control (nonuser) group in brain connectivity. The isolated nicotine and isolated cannabis users showed equally less connectivity in general. Previous research in rats has suggested that nicotine may be a "gateway drug" leading to cannabis and other drug use. Studies performed with rats exposed to THC—the main psychoactive compound found in marijuana—demonstrated an increased likelihood to self-administer nicotine that was not observed with rats exposed to heroin or cocaine, suggesting that there is something unique about the cannabis-nicotine interaction. "Most of the literature to date has focused on associations of isolated cannabis and nicotine use, even though concurrent cannabis and nicotine use is more prevalent in society than cannabis use alone," said the study's lead author, Dr. Francesca M. Filbey, the Bert Moore Chair in BrainHealth at UT Dallas. "Our findings confirm the limitations of existing research." Read full story on Medical Xpress Published on Medical Xpress August 28, 2018  

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