Table of Contents

Table of Contents

Contributors & Editors

Julie Miller

Addiction & Mental Health Writer

Last Update on June 28, 2023

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Can marijuana cause schizophrenia? It’s a question that some have asked themselves after experiencing symptoms of schizophrenia after marijuana use. And well, sometimes, and for some people, the smoke isn’t as harmless as it seems.

This enigmatic relationship between marijuana nad schizophrenia has been hotly debated in medical and scientific communities, with compelling evidence on both sides of the argument.

In this article, we will sift through the smoke and mirrors, delving into the scientific studies, personal experiences, and ongoing debates surrounding this potent plant and its potential connection to one of the most complex disorders of the mind.

Understanding Schizophrenia


Schizophrenia is a serious and chronic mental disorder that affects how a person thinks, feels, and behaves.

It’s usually characterized by periods of psychosis, which include symptoms such as hallucinations, delusions, and disordered thinking.

People with schizophrenia might hear voices other people don’t hear or believe others are reading their minds, controlling their thoughts, or plotting to harm them.

These experiences can be very real to them, sometimes making it hard to determine what’s real and what’s not.

In addition to these so-called ‘positive symptoms’, which are additions to a person’s normal experience, there can be ‘negative symptoms’, which are reductions or deficits in normal emotions and behaviors.

These might include reduced feelings of pleasure, reduced speaking, and lack of motivation.

It’s also common for individuals with schizophrenia to have difficulty concentrating, remembering things, and making decisions.

While there’s no cure for schizophrenia, the symptoms can usually be managed with a combination of medication, psychotherapy, and lifestyle adjustments.

It’s important to note that schizophrenia does not imply a “split personality” or multiple personalities, which is a common misconception often perpetuated by media depictions.

In fact, schizophrenia is a distinct condition that primarily involves a disruption in thought processes and perception of reality.

Symptom Type Symptom Description
Positive Symptoms (psychotic behaviors) Hallucinations The experience of sensations that aren’t present in the external world. Most commonly, individuals hear voices that others can’t perceive, but hallucinations can also affect other senses such as sight, smell, touch, and taste.
Delusions These are firmly held false beliefs that remain even when there is strong evidence against them. Delusions can take many forms, such as paranoid delusions (believing that one is being persecuted or harmed by others) or grandiose delusions (believing that one has special powers or abilities).
Thought Disorders These are unusual or dysfunctional ways of thinking. One form is disorganized thinking, where a person might have trouble organizing their thoughts or connecting them logically. They might speak in a garbled way that’s hard to understand.
Negative Symptoms (disruptions to normal emotions and behaviors) Alogia This refers to a reduction in the amount of speech and spontaneous thought, resulting in short, empty replies to questions.
Blunted or Flat Affect This refers to reduced emotional expressiveness, which can include a lack of eye contact, little to no change in facial expressions, a monotone or monotonous voice, and a lack of gesturing.
Cognitive Symptoms (problems with thought processes) Problems with Working Memory Difficulty with aspects of cognition that involve memory, such as the ability to keep recently learned information in mind and use it right away.
Problems with Executive Functioning Difficulty with aspects of cognition that involve the ability to plan and execute tasks.


While the exact cause is unknown, it’s generally agreed upon that individuals can inherit a certain genetic susceptibility to schizophrenia1.

However, not everyone with these genetic risks will develop the disorder, indicating that environmental factors play a critical role.

For instance, certain circumstances such as prenatal exposure to infections, malnutrition or stress, complications during birth, and psychosocial factors like childhood adversity can increase the likelihood of triggering schizophrenia in those with genetic predisposition.

Additionally, significant evidence suggests that the use of substances, particularly cannabis, in adolescence can increase the risk of developing schizophrenia later in life.

It’s crucial to note that the pathway to schizophrenia is multi-faceted, and it’s the unique combination of these factors that can culminate in the onset of the disorder.


Schizophrenia, despite being a relatively rare disorder affecting approximately 1% of the global population, imposes a significant burden on individuals, communities, and healthcare systems worldwide.

Its onset is typically in late adolescence or early adulthood, a critical period for personal and professional development, leading to significant long-term disability.

The World Health Organization ranks it among the top 15 leading causes of disability globally.

Beyond its direct impact on health, schizophrenia also brings considerable social and economic consequences.

Individuals living with schizophrenia often face stigma, discrimination, and reduced opportunities in education, employment, and social integration.

As a result, the condition contributes substantially to indirect costs, such as lost productivity and increased societal healthcare expenditure.

Despite the advancements in understanding and treating this complex disorder, schizophrenia remains a profound global health challenge that calls for continuous research, improved treatment approaches, and robust support systems.

Exploring the Effects of Marijuana


Marijuana, also known as cannabis, is a psychoactive plant that has been used for centuries both for medicinal and recreational purposes.

The plant contains over 100 active compounds called cannabinoids, with the most well-known being delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD).

THC is primarily responsible for marijuana’s psychoactive effects, inducing the ‘high’ that recreational users seek.

On the other hand, CBD doesn’t produce a ‘high’ and is often associated with therapeutic benefits, such as relieving pain and reducing anxiety.

The modes of marijuana consumption are diverse, offering different experiences based on the method chosen.

It can be smoked in a pipe, rolled into a joint, or inhaled using a vaporizer.

It can also be consumed orally in the form of edibles like candies, brownies, or drinks.

In recent years, cannabinoid oils and tinctures have gained popularity, which can be used sublingually (under the tongue) or topically on the skin.

Each method affects how quickly and intensely the active compounds are absorbed into the body, thus influencing the onset and duration of effects.

Despite its widespread use, marijuana carries potential risks and side effects, including dependency, cognitive impairment, and potential mental health issues, necessitating careful and informed usage.


Tetrahydrocannabinol (THC) and cannabidiol (CBD) are the two primary active compounds found in marijuana, each exerting distinct effects on the human body and mind.

THC is the main psychoactive ingredient in marijuana and is responsible for the typical “high” associated with its use.

Upon consumption, THC binds to cannabinoid receptors in the brain, specifically the CB1 receptors in regions that influence memory, pleasure, concentration, time perception, and coordinated movement.

This interaction alters normal functioning and produces effects such as euphoria, relaxation, heightened sensory perception, altered sense of time, and increased appetite.

However, THC can also lead to less desirable effects, such as anxiety, paranoia, and in some cases, acute psychosis, particularly at higher doses.

On the other hand, CBD does not produce a “high” and is non-intoxicating.

While it also interacts with the cannabinoid receptors, its effects are more subtle and are thought to modulate and potentially counteract some of the effects of THC. CBD is often associated with therapeutic benefits.

It has been found to have anti-inflammatory, analgesic, and anti-anxiety properties.

It’s used in treating a variety of conditions, from chronic pain and epilepsy to anxiety and insomnia.

However, while CBD has shown promise in various therapeutic contexts, more research is needed to fully understand its effects and potential uses.

Research on Marijuana and Schizophrenia

Numerous studies over the years have suggested a link between marijuana use and an increased risk of developing schizophrenia2.

These investigations point to a greater likelihood of psychotic symptoms, such as hallucinations and delusions, in individuals who consume cannabis, particularly those who begin usage during adolescence, use it frequently, or consume high-potency forms rich in THC.

Evidence shows that early and regular marijuana use may precipitate the onset of schizophrenia in individuals who are genetically predisposed to the disorder, and it might trigger the illness sooner than it would have otherwise appeared.

However, it’s crucial to note that correlation does not imply causation.

While these findings suggest a relationship between marijuana use and schizophrenia, they don’t definitively prove that marijuana directly causes schizophrenia.

The relationship is complex and likely involves interplay with other genetic, environmental, and individual factors.

More comprehensive research is needed to fully understand the intricacies of this relationship.


While anyone who uses marijuana has a potential risk, certain groups may be at higher risk of developing schizophrenia following marijuana use.

Particularly, those with a pre-existing genetic vulnerability to schizophrenia are more susceptible.

If a person has a close family member such as a parent or sibling with schizophrenia, their own risk is substantially increased, and marijuana use could potentially trigger the disorders onset.

Also, age plays a critical role.

Young people, especially adolescents who use marijuana, are at a greater risk as their brains are still in a crucial phase of development.

Some studies suggest that heavy marijuana use during adolescence can lead to an earlier onset of schizophrenia and may exacerbate the course of the disorder.

Lastly, the risk escalates with frequency and potency of use.

Regular users and those consuming high-potency strains rich in THC are found to be at an elevated risk.

It’s essential to note, however, that while these factors increase risk, they don’t guarantee that an individual will develop schizophrenia.


Emerging research has indicated that teenage males who frequently use marijuana could be at a higher risk of developing schizophrenia later in life3.

The teen years are a critical period for brain development, and the introduction of psychoactive substances like marijuana can potentially disrupt this process.

Among these disruptions, alterations in the maturation of the prefrontal cortex, a brain region implicated in schizophrenia, have been observed.

Furthermore, a study published in JAMA Psychiatry found that males who used cannabis heavily in their teens showed a higher risk of developing schizophrenia as compared to non-users.

The risk was most profound in those who started using cannabis before the age of 16 and those who used it most frequently.

However, while these findings indicate a correlation, it’s important to note that they do not prove causation.

While marijuana use may increase the risk, not all marijuana users, even heavy users or those who start young, will develop schizophrenia.

The relationship between marijuana use and schizophrenia likely involves a complex interplay of genetic, environmental, and personal factors, and more research is needed to fully understand this relationship.

Cannabis and Psychosis: Unraveling the Link


Psychosis is a defining feature of schizophrenia, marked by an impaired relationship with reality.

It’s a symptom rather than an illness, and it can manifest as hallucinations, delusions, and disordered thinking or speech.

Hallucinations involve perceiving things that aren’t there, such as hearing voices, while delusions are strongly held false beliefs that aren’t aligned with reality.

Disordered thinking is seen when a person’s thoughts are chaotic, illogical, or nonsensical.

These psychotic symptoms can disrupt a person’s perception, thoughts, emotions, and behavior, significantly affecting their daily life and ability to function.


Cannabis-induced psychosis refers to a condition where the use of cannabis leads to psychotic symptoms such as hallucinations, delusions, and disordered thinking4.

These symptoms are similar to those seen in schizophrenia, and they typically occur while the person is under the influence of the drug or shortly after use.

Some individuals may only experience these symptoms for a brief period, while for others, these symptoms might persist and evolve into a long-term condition like schizophrenia, particularly in those with a genetic predisposition or other risk factors for the disorder.

However, the relationship between cannabis use, cannabis-induced psychosis, and schizophrenia is complex and not fully understood.

It’s also important to highlight that although cannabis can induce psychotic symptoms, most people who use cannabis do not develop enduring psychosis or schizophrenia.


High-potency marijuana strains, particularly those rich in THC, and frequent or heavy use of marijuana, have been linked with an increased risk of developing psychosis.

THC, the primary psychoactive compound in marijuana, has been shown to induce transient psychotic symptoms even in healthy individuals.

Frequent consumption of high-THC marijuana strains can amplify these effects and potentially lead to more persistent psychotic episodes, such as those seen in cannabis-induced psychosis.

Furthermore, a study published in The Lancet Psychiatry indicated that daily cannabis users, especially those consuming high-potency strains, were several times more likely to experience a first psychotic episode compared with non-users.

It’s noteworthy that these findings demonstrate correlation, not causation, and individual reactions to marijuana can vary widely.


Cannabis-induced psychosis, a condition where an individual experiences psychotic symptoms such as hallucinations or delusions following marijuana use, often ceases when the individual stops using the drug.

Symptoms may fade over days or weeks, and full recovery is typically expected with sustained abstinence.

However, this is not always the case.

Some individuals may experience prolonged or even permanent psychiatric effects, particularly those with a pre-existing vulnerability to mental health disorders like schizophrenia.

Further, repeated episodes of cannabis-induced psychosis can potentially increase the risk of developing a chronic psychotic disorder over time5.

The extent to which cannabis-induced psychosis is reversible largely depends on individual factors such as genetics, the severity and frequency of use, the potency of the cannabis used, and overall mental health.

It’s essential for anyone experiencing cannabis-induced psychosis to seek professional help and consider cessation of marijuana use.

Understanding the Self-Medication Hypothesis

Despite the potential risks, some individuals with schizophrenia may turn to marijuana as a form of self-medication.

The reasons for this are multifaceted.

Some people may use it to alleviate negative symptoms of schizophrenia, such as lack of motivation or emotional flatness, which are often less responsive to traditional antipsychotic medications.

Others may find that marijuana offers temporary relief from anxiety, depression, or insomnia, which often co-occur with schizophrenia.

Additionally, the euphoric effects of THC might provide a temporary escape from the harsh realities and distress associated with living with a chronic mental health disorder.

However, it’s critical to note that while marijuana may provide short-term symptom relief for some, the long-term consequences can be detrimental.

It can exacerbate psychotic symptoms, interfere with the effectiveness of prescribed medication, and increase the likelihood of relapses and hospitalizations.

As such, professional guidance is essential when considering any form of self-medication for schizophrenia.

The Way Forward: Future Research and Treatment


While current research has advanced our understanding of the relationship between marijuana use and schizophrenia, numerous questions remain, and further investigation is necessary.

Most studies to date have been observational, making it challenging to draw definitive conclusions about causality.

It’s also important to understand the exact mechanisms through which marijuana might influence the development or exacerbation of schizophrenia.

Furthermore, the impact of factors such as the potency of marijuana, frequency of use, individual genetic makeup, and age of onset of use, needs to be more comprehensively studied.

With the growing trend toward marijuana legalization and the consequent increase in use, it’s crucial to accurately understand the potential mental health risks involved.

More in-depth, longitudinal, and experimental studies could help clarify these issues and guide policy-making, clinical practices, and public health messaging around marijuana use.


Treatment for both marijuana abuse and schizophrenia can significantly enhance the quality of life for affected individuals.

In the case of marijuana abuse, treatment can help individuals manage their cravings, learn healthier coping mechanisms, and understand the potential risks and consequences of continued use.

This can lead to better physical health, improved relationships, increased productivity, and overall well-being.

For schizophrenia, effective treatment can greatly reduce the impact of symptoms and allow individuals to lead fulfilling, meaningful lives.

Antipsychotic medications can help manage hallucinations, delusions, and disordered thinking, while psychotherapy can equip individuals with social skills and strategies to cope with the everyday challenges posed by the disorder.

Supportive services can further aid in employment, housing, and academic pursuits.

In both cases, early intervention is crucial.

The sooner treatment begins, the better the potential outcome.

Therefore, it’s crucial to seek help promptly if you or someone you know is struggling with marijuana abuse or showing signs of schizophrenia.

Timely treatment can significantly improve the course of both conditions and help individuals to reclaim their lives.


In our quest for understanding, let’s remain hopeful and resilient.

Each new study, every shared experience, brings us one step closer to demystifying the complexities of both marijuana use and schizophrenia.

As we unravel these threads, we gain not just knowledge, but the power to shape healthier lives and societies.

So here’s to a future where we’re not just surviving, but thriving – one enlightened choice at a time.

If you or a loved one is struggling with Addiction, please view our drug rehab program options and call free confidential assessment today.

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[1] The Genetics of Schizophrenia

[2] Cannabis use and the risk of developing a psychotic disorder

[3] Young men at highest risk of schizophrenia linked with cannabis use disorder

[4] Cannabis and Psychosis Through the Lens of DSM-5

[5] Continued cannabis use and risk of incidence and persistence of psychotic symptoms: 10 year follow-up cohort study

Published: 6/28/2023

Main Contributor: Julie Miller

Co-Contributor: Susana Spiegel

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Author & Reviewers

julie miller recovery writer and author
Julie is a recovery advocate, with over two years sober. She is a recovery speaker who believes people can change for the better. Her mission is to write factual, helpful information about addiction, treatment, and recovery. She believes that no one should be left in the dark about the process at any stage of their recovery.
lionel estrada lisac clinical director

Lionel is the Clinical Director of Cornerstone’s treatment facilities in Arizona. He has had over 4 years at Cornerstone. He is personally in recovery and passionate about helping others overcome substance abuse and mental health challenges, he is trained as an EMDR, adopting a trauma-informed approach to treat the underlying issues of conditions.

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