High lifetime prevalence of regular nitrous oxide use in French medical students.

Background: Although nitrous oxide (N₂O) is increasingly misused recreationally, its use and risks among medical students who have professional access to it are rarely explored.Objectives: To investigate the recreational use of N₂O among medical students in Paris Region (France).Methods: This cross-sectional study used an online questionnaire distributed in 2022 through social networks, to all medical students (undergraduate student from the 2nd year of medical studies to residents until the end of the residency) from the six medical universities in Paris Region. We collected demographic characteristics, patterns of N₂O consumption, co-consumptions, and N₂O training (academic course or self-training). Factors associated with N₂O consumption and complications were analyzed using multivariable logistic regressions.Results: The questionnaires of 444 students (mean age: 25.9 years (SD = 2.69), 75.5% female, and 63.74% residents) were analyzed. Recreational N₂O consumption was reported by 71.85% of students and 20.50% consumed at least monthly. N₂O consumption was associated with being a resident (versus undergraduate student) (adjusted OR (aOR) = 3.07[1.45-6.72]; p < .01), receiving training on N₂O (aOR) = 3.13[1.84-6.24]; p < .01), and consumption of cannabis (aOR = 18.21[3.47-104.26]; p < .01), ecstasy (aOR = NA, p = .048) and poppers (aOR = 13.9[2.64-77.94]; p < .01). Complications (mainly dizziness, paresthesia and burns) were reported in 8.15% of students consuming N₂O. They were associated with consuming more than 10 balloons per intake (aOR = 6.04[1.32-25.00); p < .01) and inversely associated with receiving training (aOR = 0.35[0.14-0.86]; p = .01).Conclusions: Almost three-quarters of medical students experienced recreational N₂O consumption, particularly with poly-drug use. Given that complications were associated with high consumption and lack of education, risk training and screening for N₂O consumption could be beneficial.