A study published in the journal Addiction by researchers from the University of Granada in Spain shows that vaporized cannabidiol (CBD) has little to no effect on visual function and driving performance.
The randomized, double-blind, placebo-controlled crossover experiment assessed whether CBD impacts the ability to drive safely.
The study involved 30 participants with an average age of 26.2 years, 70% of whom were male. All participants were occasional CBD or cannabis users and held valid driving licenses. Over three experimental sessions spaced a week apart, participants vaporized a placebo, 15% CBD (16 mg), or 30% CBD (32 mg). Driving performance was evaluated using an overall driving performance score (ODPS), while secondary outcomes included various visual function metrics and other driving parameters.
The findings showed no significant changes in ODPS after using either dose of CBD compared to the placebo. Visual function largely remained unaffected, except for a slight but statistically significant decrease in motion detection. Similarly, secondary driving outcomes, including lane control, reaction time, and collisions, showed no significant differences.
The study concludes by stating that “Consumption of vaporized cannabidiol in 16 mg and 32 mg doses does not appear to affect simulated vehicle driving performance and visual function.”
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