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Parent and Peer Influences and Longitudinal Trajectories of Cannabis Use from Adolescence to Young Adulthood

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Abstract

Positive parent and peer influences are frequently targets for enhancing prevention and intervention programs for adolescent substance use. However, differences in the patterns of cannabis use trajectories in the transition from late adolescence to young adulthood may affect the quality of relationships with parents and peers. We examined how parent and peer influences in adolescence and in young adulthood relate to cannabis use trajectory groups that distinguish high risk trajectories of cannabis use across ten years; namely, Increasers (20%) and Chronic users (11%), from lower risk user groups of Abstainers (29%), Occasional users (27%), and Decreasers (14%). We assessed mother and father communication and parent monitoring, and as well as experiences of peer victimization and engagement with peers involved in positive and negative activities. Data were from the Victoria Healthy Youth Survey (V-HYS). Youth were randomly recruited in 2003 (N = 662; 48% male; Mage = 15.5) and followed biennially for ten years to 2013 (N = 478; 45% male; Mage = 25.8). Parent monitoring distinguished groups in adolescence, but, as expected, monitoring was low and not significant in young adulthood. Levels of parent communication were high across both age groups, but were not related to the cannabis trajectory groups. Peer influences were similar in adolescence and young adulthood, in showing that deviant peer influences remain greater in high risk user groups across this transition. Implications for preventive and treatment interventions for high risk users in young adulthood are discussed.

Highlights

  • This 10 year longitudinal study adds to an understanding of how different patterns of use of cannabis in the transition from adolescence to young adulthood are related to changes in parent and peer influences related to these differences.

  • Peer influences were similar in adolescence and young adulthood, showing that deviant peer influences persist in their associations with high risk use across this transition.

  • Parent monitoring had protective effects in adolescence but not young adulthood. The impact of parent communication on cannabis use was not significant in young adulthood, controlling for levels established in adolescents, however levels of communication were high in both adolescence and young adulthood.

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Acknowledgements

The Victoria Healthy Youth Survey study and this research were supported by grants from the Canadian Institute for Health Research (#88476; #79917; #192583; #130500; SHI-155410). We appreciate the contributions of all youth who participated in this research for over a decade.

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Correspondence to Bonnie Leadbeater.

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The authors declare no competing interests.

Ethical Approval

The University of Victoria’s Human Ethics Review board approved each wave of the study.

Informed Consent

Youth and the parent or guardian for youth under age 18 gave written consent for their participation at each wave.

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Leadbeater, B., Ames, M.E., Contreras, A. et al. Parent and Peer Influences and Longitudinal Trajectories of Cannabis Use from Adolescence to Young Adulthood. J Child Fam Stud 31, 3181–3191 (2022). https://doi.org/10.1007/s10826-022-02353-7

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  • DOI: https://doi.org/10.1007/s10826-022-02353-7

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