Mental Health Impacts
This page provides information on the connection between marijuana and mental health problems.
Psychosis is a loss of touch with reality, including:
- Thought disorders
Psychosis may be seen with:
- Bipolar disorder
- Various medical conditions
- Other psychiatric conditions
- Independent of other conditions
Marijuana And Bipolar Disorder
- New research suggests marijuana causes manic symptoms in those with bipolar disorder.
- Marijuana use is associated with a 3-fold increase in the risk for the new onset of manic symptoms.
- Marijuana use may worsen the severity and/or duration of manic phases for people with bipolar disorder.
- This underscores the importance of discouraging marijuana use among those with bipolar disorder.
Marwaha, Cannabis use and mania symptoms: A systemic review and meta-analysis. Journal of Affective Disorders, September 24, 2014.
Marijuana And Schizophrenia
- Marijuana use is associated with an increased risk of developing schizophrenia
- To a degree consistent with a causal relationship
- One study found 13% of schizophrenia cases could be averted if marijuana use was prevented
- Risk factors include:
- Genetic predisposition to schizophrenia/psychosis
- Early marijuana use, especially before age 15
- Frequent, heavy, and/or high-THC marijuana use
- Marijuana use worsens positive symptoms of schizophrenia, including hallucinations and delusions
Marijuana And Other Mental Illness
- Regular, and in particular, heavy (quantity or potency or both) cannabis use may be linked to:
- Suicidal thoughts/suicide attempts
- Anxiety disorder
- Panic attacks
All information was obtained through research compiled in the 2017 report published by the National Academies of Sciences and Medicine titled The Health Effects of Cannabis and Cannabinoids: The Current State of Evidence and Recommendations.