Inclusion Criteria:  18-55 yrs/ old Current driver's license and history of repeated highway vehicle driving experience (at least 2 years) Recent, recurrent CNB use and felt high when used Able to read, speak, and understand English Able and willing to provide written informed consent, and willing to commit to the study protocol  Exclusion Criteria:  Current marijuana tolerance, desire to cut down, or cravings to use during periods of abstinence New CNB users who have not used at least once during their lifetime. Positive screen for drug and alcohol (except THC) on test day will result in rescheduling the appointment Former CNB users who are abstaining Pregnancy, breastfeeding, and ineffective birth control methods. History of adverse psychological or medical effects following cannabis use serious medical, neuro-ophthalmological, or neurological illness (i.e. cancer, seizure disorders, encephalopathy) History of head trauma with loss of consciousness > 30 minutes or concussion lasting 30 days. IQ <80 on the Wechsler Abbreviated Scale of Intelligence Inability to comprehend written instructions using the WRAT 4 reading achievement test Any medical/neurological condition that could compromise neurocognitive performance (i.e. epilepsy, multiple sclerosis, fetal alcohol syndrome) Uncontrolled, persistent high blood pressure Anyone deemed unsafe to study personnel for any reason