Cannabis use, cognitive performance, and symptoms of attention deficit/hyperactivity disorder in community adults.

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Abstract

There is some evidence that cannabis use is associated with lower cognitive performance and symptoms of attention-deficit hyperactivity disorder (ADHD), but the existing literature is relatively inconsistent, potentially due to small samples in previous studies. Using a dimensional design, the current study examined cannabis use severity and age of first cannabis use in relation to neurocognitive performance and ADHD symptoms in a large sample of community adults (N=1008, M age =38.49, 56.0% female). Participants were assessed for cannabis involvement, neurocognitive performance, and ADHD symptoms. Dimensional relationships were investigated using multiple hierarchical regressions. Using a covariate model of age, income, sex, alcohol use, and tobacco use, severity of cannabis involvement was significantly associated with greater endorsement of both hyperactive-impulsive and inattentive ADHD symptoms, but not with any other cognitive measures in the full sample. Exploratory analyses found greater cannabis use severity was associated with digit span forwards and hyperactive ADHD symptoms in young adults (n=371), and was associated with greater delay discounting, hyperactive and impulsive ADHD symptoms in high-risk cannabis users (n=161). Age of first cannabis use was not significantly associated with any neurocognitive variables or ADHD symptomatology in all analyses. The current findings provide evidence of a link between current cannabis misuse and both hyperactive and inattentive ADHD symptoms in general, and possible links to attention and impulsive delay discounting in subgroups of cannabis users, but no associations in other cognitive domains or implication of earlier initiation of cannabis use in relation to cognitive performance or ADHD.

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