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  • The gradual legalization of marijuana (cannabis) across the United States has increased its popularity for recreational and medicinal use. This has initiated research on the long-term effects of marijuana, particularly if it kills brain cells. 

    Studies have found an association between long-term use and impairment in several areas of the brain. Damage may include reduced gray matter, impaired cognition, and a loss of brain cells associated with memory. 

    Short-Term Effects Of Marijuana

    When you use marijuana, the active ingredient tetrahydrocannabinol (THC) enters your bloodstream and is carried to your brain. 

    Then THC attaches to cannabinoid receptors in your endocannabinoid system. The endocannabinoid system is responsible for several functions, including memory and mood. 

    The brain is also flooded with dopamine, which causes the euphoria associated with a marijuana “high.” Although some people experience heightened mood and relaxation, others may experience anxiety, paranoia, and psychosis

    The risk of adverse side-effects increases with heavy or frequent use of marijuana. 

    Long-Term Effects Of Marijuana

    Frequent and long-term use of marijuana may cause changes in many areas of the brain, especially in adolescents. Specifically, drug use can affect cognitive processes and may cause structural abnormalities in the brain.

    Long-term effects on the brain may include:

    • memory impairment
    • difficulty learning
    • decreased attention
    • difficulty thinking
    • difficulty problem-solving
    • loss of coordination

    How Marijuana Impacts Brain Matter

    Gray matter consists of cells used to process information in the brain. Frequent marijuana use may reduce gray matter, which can cause issues with impulse control, decision-making, and learning. 

    Marijuana may also cause damage to white matter, which impacts communication between areas of the brain. 

    According to the National Institute on Drug Abuse, a longitudinal study in New Zealand found that heavy marijuana use beginning in adolescence resulted in reduced IQ points. The IQ scores did not improve in adolescents even after stopping marijuana use. 

    Long-Term Effects Of Marijuana On Cognition

    Frequent cannabis use may affect the hippocampus, which is responsible for memory. Experiments on animals have found THC may cause permanent effects on the ability to form new memories. 

    As a person ages, they naturally lose neurons (brain cells) in the hippocampus. Heavy marijuana use may speed up this process, making it difficult to learn new information. The amount of damage caused may depend on the age you are first exposed to marijuana and how long you use it. 

    How Marijuana Affects The Reward System

    Similar to other drugs, chronic marijuana use can lead to changes in your brain’s reward system. As your brain adjusts to the high amounts of dopamine released by marijuana, it becomes less sensitive to other stimuli.

    Increased dopamine is associated with pleasurable feelings, which can make it more difficult to stop using marijuana. Continued use can increase tolerance and eventually lead to dependence and addiction, which may require treatment. 

    Treating Marijuana Use Disorder

    Chronic marijuana use can lead to marijuana use disorder and increases the risk of progressing to other drugs. Along with addiction, marijuana use can negatively affect your mental health and quality of life. 

    The best way to preserve healthy brain function is to avoid using marijuana, especially if your brain is still developing. It can be difficult to stop using marijuana on your own because of its effects on your brain. If you think you or a loved one is addicted, you may require detox and treatment.

    Some of the options available for marijuana addiction treatment include:

    • inpatient treatment
    • outpatient treatment
    • behavioral therapy

    If you or a loved one would like more information on our addiction treatment program, please contact Ark Behavioral Health today.

    Written by Ark Behavioral Health Editorial Team
    ©2024 Ark National Holdings, LLC. | All Rights Reserved.
    This page does not provide medical advice.

    American Psychological Association (APA) - Marijuana And The Developing Brain
    National Institute On Drug Abuse (NIDA) - Regular Marijuana Use Is Associated With Differences in Brain Gray Matter and Connectivity
    National Institute On Drug Abuse (NIDA) - What Are Marijuana's Long-Term Effects On The Brain?
    Proceedings Of The National Academy Of Sciences Of The United States Of America - Persistent Cannabis Users Show Neuropsychological Decline From Childhood To Midlife

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