Journal of safety research

Understanding cannabis use and car crashes: Insights from a randomized trial using a driving simulator on THC blood levels and subjective measures of sleepiness and performance.

Journal of safety research December 1, 2025 Bibiana Cardozo, Sarah Hartley, Nicolas Simon et al.

To investigate whether THC inhalation increases driving collisions, and to explore the relationship between car crashes and self-assessed driving ability as measured by Visual Analog Scales (VAS) and the Karolinska Sleepiness Scale, 30 male volunteers aged 18-30 years old, with a BMI of 18.5-26.2 Kg/m2, moderate tobacco and caffeine consumption, and at least one year of cannabis use either...