The occasional use of cannabis during late adolescence is not independently associated with adverse effects on cognitive abilities in young adulthood, according to longitudinal data published in the journal Drug and Alcohol Dependence. A team of investigators affiliated with the University of Colorado at Boulder assessed the impact of cannabis use on cognition, executive function, and working memory in 856 individual twins. Cannabis consumers were compared to their non-using twins in late adolescence and then again in their early twenties. Most of the cannabis consuming participants in the study reported occasional use of the substance, but not daily use. Authors found “little support for a causal effect of cannabis use on cognition. This conclusion is consistent with those from previous…
The use of cannabis during adolescence is not associated with structural brain differences in adulthood, according to longitudinal data published in the journal Drug and Alcohol Dependence. Researchers concluded, concluded, “[T]he patterns of cannabis use typically seen in community-dwelling adolescents does not appear to have lasting effects on brain structure.”
Cannabis exposure is not associated with significant changes in brain morphology in either older or younger subjects, according to a pair of newly published studies.
The frequent use of cannabis is not associated with changes in brain structure, according to data published online ahead of print in the journal Addiction. Authors reported, “[N]ormal variation in cannabis use is statistically unrelated to individual differences in brain morphology as measured by subcortical volume.”
Neither the occasional nor the heavy use of marijuana by adolescents is associated with decreased motivation, according to clinical data published online ahead of print in the journal Substance Use & Misuse. Authors reported: “After controlling for confounds, no significant differences were observed between regular and light users on any motivation index.”
Cannabis use by teens is not independently linked with adverse changes in intelligence quotient or executive functioning, according to longitudinal data published online ahead of print in the journal Addiction. Investigators concluded, “Short-term cannabis use in adolescence does not appear to cause IQ decline or impair executive functions, even when cannabis use reaches the level of dependence.”
Alcohol consumption is associated with negative changes in gray matter volume and in white matter integrity, while cannabis use is not, according to data published online ahead of print in the journal Addiction.
A recently released white paper published by the National District Attorneys Association is calling for the federal government to strictly enforce anti-cannabis laws in states that have regulated its production and distribution for either medical or recreational purposes.
NORML reviews the top news stories of 2015.
Two new studies published online today in JAMA (Journal of the American Medical Association) Psychiatry provide little support for previous claims that cannabis exposure is significantly harmful to the developing brain.