Cannabis Use Linked to Surge in Schizophrenia Cases: Study

Recent research from Canada has raised significant concerns about the potential link between cannabis use and a rise in schizophrenia cases. The study, published in the journal JAMA Network Open, found that new cases of schizophrenia triggered by cannabis have tripled since the drug was legalized in Canada in 2015.

Challenges to the View of Safety

Advocates often claim that marijuana is safe because it is ‘natural.’ However, the findings from Canadian researchers challenge this notion. They suggest that regular cannabis use is strongly associated with an increased risk of schizophrenia. In Ontario, the figures rose from 4% to over 10% in just under two decades.

Dr. Daniel Myran, an expert in public health and preventative medicine at the University of Ottawa and a co-author of the study, emphasized, “Regular cannabis use is strongly associated with an increased risk of schizophrenia. The tripling of schizophrenia cases associated with a cannabis use disorder over the past 17 years and rising cases of psychosis underscores the urgent need for targeted prevention strategies, particularly for younger populations who appear to be at the greatest risk.”

Implications for Public Health

The study highlights a growing public health challenge posed by the combination of increasingly high-potency cannabis and rising regular cannabis use. According to Dr. Myran, “Our study highlights the growing public health challenge posed by the combination of increasingly high-potency cannabis and rising regular cannabis use.”

The findings are particularly alarming given the legal status of cannabis in many countries, including Canada and parts of the United States. In Canada, medical cannabis has been legal since 2015, and recreational use was introduced in 2018. In the UK, laws around the medical use of cannabis were relaxed almost seven years ago, making it available under strict guidelines for conditions like epilepsy, chronic pain, and multiple sclerosis.

UK’s Cannabis Prescription Trends

Despite the availability of medical cannabis on the NHS in the UK, prescription numbers remain low. Just 110 prescriptions have been issued in the past five years. This contrasts sharply with the United States, where cannabis has seen a meteoric rise in legalization, culminating in legal recreational use in 24 states.

Worsening Symptoms and Hospital Admissions

The study also found that cannabis not only triggers new cases of schizophrenia but also exacerbates symptoms in existing patients. The number of individuals requiring hospital care for cannabis use disorder rose by 270% following the legalization of non-medical use in Canada.

Over the same period, the percentage of new schizophrenia cases who had previously received hospital care for the disorder increased from 7% to 16%. This trend suggests a concerning overlap between mental health issues and substance abuse.

Increasing Hospitalizations Among Older Adults

The growing concern about cannabis use extends beyond younger populations. In the UK, NHS figures last month showed a record number of older adults were hospitalized after smoking cannabis. More than 2,700 adults aged 65 and older, including nine over 90, were admitted to hospital in England between April 2023 and March 2024, representing a 56% rise on pre-pandemic levels and a staggering 650% increase since a decade ago.

Patients reported experiencing hallucinations, withdrawal symptoms, and even suffering from cannabis poisoning, highlighting the dangers associated with the drug at all ages.

Popularity and Patterns of Cannabis Use

Separate annual figures from the Office for National Statistics indicate that cannabis remains the most popular drug among 16 to 59-year-olds in England and Wales. Use was highest among 20 to 24-year-olds last year, with just over a quarter of young adults having smoked marijuana at least once in their lifetime.

In the UK, private cannabis prescriptions have doubled, reaching nearly 180,000 last year, according to the Care Quality Commission.

The Impact of THC

THC, one of the main active components of marijuana, affects parts of the brain associated with mood, attention, and memory by stimulating the release of dopamine, the hormone responsible for feelings of reward and pleasure. While small, infrequent doses have little long-term impact, prolonged and regular use can disrupt brain signals in these critical areas.

Studies suggest that frequent cannabis use can increase the risk of serious mental illnesses like schizophrenia, as well as conditions like insomnia, social anxiety disorder, and suicidal thoughts.

The Cause and Symptoms of Schizophrenia

The exact cause of schizophrenia is not fully understood, believed to involve a mix of genetic factors, abnormalities in brain chemistry, and potential viral infections or immune disorders. Symptoms typically emerge between the ages of 16 and 30 and can include hallucinations, disorganized thoughts, and withdrawal from social interactions.

Figures suggest that approximately 1% of the world population suffers from schizophrenia, with around 685,000 cases in the UK and two million in the US.

Conclusion

The findings from this Canadian study raise significant alarms about the potentially serious health risks associated with cannabis use, particularly in relation to the development and exacerbation of schizophrenia. As more countries embrace the legalization of cannabis, the need for comprehensive public health strategies to monitor and mitigate these risks becomes increasingly crucial.

As cannabis laws continue to evolve, it is essential that policymakers and healthcare providers remain vigilant and prioritize research and education to support informed decision-making.

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