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Investigating the causal effect of cannabis use on cognitive function with a quasi-experimental co-twin design

Ross, J. Megan; Ellingson, Jarrod M.; Rhee, Soo Hyun; Hewitt, John K.; Corley, Robin P.; Lessem, Jeffrey M.; Friedman, Naomi P.

Año: 2020

Background: It is unclear whether cannabis use causes cognitive decline; several studies show an association between cannabis use and cognitive decline, but quasi-experimental twin studies have found little support for a causal effect. Here, we evaluate the association of cannabis use with general cognitive ability and executive functions (EFs) while controlling for genetic and shared environmental confounds in a longitudinal twin study. Methods: We first examined the phenotypic associations between cannabis initiation, frequency, and use disorder with cognitive abilities, while also controlling for pre-use general cognitive ability and other substance involvement. We tested the concurrent association between the cannabis use variables and cognitive abilities in late adolescence and young adulthood and the longitudinal association between cannabis use variables during adolescence and young adulthood cognitive abilities. Next, we used multilevel models to test whether these relations reflect between- and/or within-twin pair associations. Results: Phenotypically, cannabis use was related to poorer cognitive functioning, although most associations were negligible after accounting for other substance use. Nevertheless, there were few significant within-family twin-specific associations, except that age 17 cannabis frequency was associated with worse age 23 Common EF and general cognitive ability. Conclusions: We found little support for a potential causal effect of cannabis use on cognition, consistent with previous twin studies. Results suggest that cannabis use may not cause decline in cognitive ability among a normative sample of cannabis users.

Tipo documento:

Artículo

Número/Volumen:

206

Páginas:

0-0

Fuente:

DRUG AND ALCOHOL DEPENDENCE

Palabras clave:

Cannabis; Intelligence; Executive control; Adolescence; Young adulthood

 

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Última actualización: 28/03/2024

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