Overview

• A randomized clinical trial tested 191 regular users after at least 48 hours of abstinence using a driving simulator at UC San Diego’s Center for Medicinal Cannabis Research.
• Driving performance showed no association with participants’ cannabis use history, time since last use, or measured blood THC concentrations.
• A secondary analysis found the heaviest daily users performed no worse than a small group of healthy nonusers during the abstinence period.
• Authors caution that results come from a controlled lab setting with limited driving scenarios and a small nonuser comparator.
• The peer-reviewed study was published September 6 in Psychopharmacology and received partial funding from a California state award to CMCR.