Rising mental health and substance use crises in young adults, with cannabis involvement

This Danish study tracked dual diagnosis (simultaneous mental illness and substance use disorders) among adolescents and young adults ages 12-25 between 2010 and 2022, drawing on comprehensive national health and social service records. Researchers found a sharp increase in dual diagnoses from 2010 to 2017, followed by a declining trend. The data reveals important patterns: males were significantly more affected than females, and young adults aged 22-25 showed the highest rates. Notably, cannabis-related disorders were among the most frequently co-occurring conditions alongside mental health diagnoses like schizophrenia, schizotypal and delusional disorders, as well as neurotic and stress-related disorders.

A critical finding is the shift in treatment-seeking behavior: while more young people were enrolled in substance use treatment at their first mental health contact, fewer were subsequently enrolling in substance abuse services within a year after their initial diagnosis. This suggests potential gaps in integrated care or barriers to sustained treatment engagement. The study also noted a slight improvement in educational outcomes, with more dual-diagnosis patients completing primary school, though this modest increase may reflect broader educational trends rather than treatment-related improvements.

For cannabis users and clinicians, these findings highlight the importance of recognizing and addressing co-occurring mental health conditions, particularly among young males and young adults. The data underscore that mental illness and substance use disorders—including cannabis-related disorders—frequently develop together, suggesting integrated treatment approaches may be essential for better outcomes in this vulnerable population.