The effect of cannabis edibles on driving and blood THC.
Journal of cannabis research May 31, 2024 S Zhao, B Brands, P Kaduri et al. 13 citations
Cannabis edibles impair driving less than smoked cannabis, despite causing intoxication. After consuming an average of 7.3 mg of THC, participants drove slower 2 hours later but showed no significant weaving, speed changes, or reaction time differences under standard or dual-task conditions. Blood THC levels peaked at about 2.8 ng/mL, lower than after smoking, and were not correlated with driving impairment. Subjective intoxication lasted up to 7 hours, and participants felt less able to drive for up to 6 hours. Detecting driving impairment from edibles may be difficult because blood THC levels are low and not linked to performance deficits.