Cannabis use was more common among: ... Youth on Medicaid or living in more deprived neighborhoods
Regular reminder that correlation =/= causation. Living a more stressful life due to poverty makes both mental illness and adolescent cannabis use more common.
That said there is a credible biological pathway to cannabis use having a causal role:
THC acts on CB1 receptors, which are highly expressed in the adolescent brain and play a key role in emotional regulation, motivation, and cognitive development.
However we still don't have definitive evidence of causation:
Q: Does this study prove cannabis causes mental illness? A: While causation can’t be definitively established, cannabis use was associated with an increased risk of developing psychiatric conditions
