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Updated: Nov 20, 2025

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
Published on: August 18, 2020
Multiple clinical risks for cannabis users during the COVID-19 pandemic
Ellen Mello Borgonhi1,2, Vanessa Loss Volpatto1,2, Felipe Ornell1,2
1Center for Drug and Alcohol Research, Hospital de Clínicas de Porto Alegre, Universidade Federal Do Rio Grande Do Sul, Street Professor Álvaro Alvim, 400. Zip-code: 90420-020, Porto Alegre, RS, Brazil.
Individuals using cannabis may face increased risks for severe COVID-19 complications due to respiratory vulnerability. This highlights the need for greater clinical awareness and targeted interventions for cannabis users during pandemics.
Area of Science:
- Public Health
- Infectious Diseases
- Addiction Medicine
Background:
- The COVID-19 pandemic has significantly impacted global public and mental health systems.
- Identifying at-risk populations, including substance users, is crucial for effective prevention and treatment.
- Increased psychoactive substance use, particularly cannabis, was observed during pandemic lockdowns.
Discussion:
- Cannabis use may compromise respiratory health, potentially increasing vulnerability to viral infections like COVID-19.
- Similarities exist between the cardiovascular and respiratory effects of cannabis smoking and tobacco smoking.
- Cannabis smoke contains toxic substances like tar, linked to lung diseases, and chemicals retained longer in the body.
Key Insights:
- Regular cannabis users might be more susceptible to COVID-19 infection and its complications.
- Cannabis users are not currently recognized as a primary risk group for COVID-19, despite potential respiratory risks.
- The long-term retention of cannabis chemicals and presence of toxins warrant further investigation regarding COVID-19 outcomes.
Outlook:
- Further research is needed to fully elucidate the risks associated with cannabis use during viral pandemics.
- Clinicians require enhanced awareness of cannabis-related risks to develop specific intervention strategies.
- This population warrants increased clinical attention globally to mitigate potential health disparities during public health crises.
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