In a new study, young rats exposed to marijuana had a more a pleasurable first experience with cocaine compared to adult rats.
Evidence continues to mount regarding the adverse effects teenage marijuana consumption manifests later in life. Recent studies have linked smoking cannabis as an adolescent with developing insomnia issues and depression as an adult. New research now indicates early cannabis use rewires developing brains to become more sensitive to their first experience with cocaine.
The study, published this week in the Proceedings of the National Academy of Sciences, exposed adolescent and adult rats to a synthetic molecule resembling THC. Scientists found the younger rats underwent key molecular changes in their prefrontal cortex, though the adult rats did not experience these changes. Scientists then exposed these rats to cocaine. Once the young rat brains were rearranged, it made their first experience with cocaine more intense.
As previous studies have demonstrated, positive first experiences with a drug could lead to more addictive behavior down the road. This alteration becomes more problematic to individuals already genetically predisposed to developing addiction.
“We know from human epidemiological studies that individuals who abuse cocaine have a history of early cannabis use, and that a person’s initial response to a drug can have a large impact on whether they continue to use it. But many questions remain on how early cannabis exposure affects the brain,” study senior co-author Denise Kandel said in a statement.
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