Abstract
Background: Cannabis use is becoming increasingly prevalent worldwide, yet the full spectrum of its effects largely remain unknown. Although cannabis have immunomodulatory properties, there remains a significant gap in our understanding of the potential impact of marijuana use on COVID-19 outcomes. The purpose of this study is to evaluate the effect of chronic cannabis use on severe COVID-19. Materials and Methods: National Inpatient Sample Database was used to sample individuals admitted with the diagnosis of COVID-19. Patients were divided into two groups based on cannabis use. Baseline demographics and comorbidities were collected using ICD-10 codes. Patients with missing data or age under 18 were excluded. Propensity matching using R was performed to match cannabis users to non-cannabis users 1:1 on age, race, gender, and 17 other comorbidities. The primary outcome was severe COVID-19 infection, defined as a composite of acute respiratory failure, intubation, acute respiratory distress syndrome (ARDS), or severe sepsis with multiorgan failure. Results: Out of 322,214 patients included in the study, 2,603 were cannabis users. Cannabis users were younger and had higher prevalence of tobacco use. On initial analysis, cannabis users had significantly lower rates of severe COVID-19 infection, intubation, ARDS, acute respiratory failure, severe sepsis with multiorgan failure, mortality, and shorter length of hospital stay. After 1:1 matching, cannabis use was associated with lower rates of severe COVID-19 infection, intubation, ARDS, acute respiratory failure, severe sepsis with multiorgan failure, mortality, and shorter length of hospital stay. Conclusion: Cannabis users had better outcomes and mortality compared with non-users. The beneficial effect of cannabis use may be attributed to its immunomodulatory effects.
Published Version
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