https://pmc.ncbi.nlm.nih.gov/articles/PMC11032069/

PSA from a cannabis user with ADHD, there is a reason I only use it on holidays and not for treating my mental health issues. It actively makes them worse. If you need to self-medicate for insurance reasons, coffee or caffeine pills and setting timers and alerts on your phone are far more effective.

While experimentation with psychoactive substances is relatively normative for adolescents and young adults, those with ADHD are more likely to experience negative consequences of use compared with neurotypical peers and despite comparable rates of use.21,22 A closer look at the worsening risk of cannabis use problems in ADHD populations is warranted, starting with cannabis use trends, effects on cognition, and motivators for use.

Chronic cannabis users with ADHD may worsen preexisting deficits in working memory and executive function in ways that may not become apparent until later in life, with long-lasting, persistent effects despite discontinuing use