Researchers conclude that medical cannabis use does not negatively impact driving performance in experienced patients.

Queensland, Australia: Patients who consume botanical cannabis over extended periods do not exhibit significant changes in their simulated driving performance, according to data published in the Journal of Safety Research.

Australian researchers assessed patients’ simulated driving performance at baseline and 45 minutes after they vaporized prescribed doses of cannabis flowers. (Under Australian law, physicians may authorize cannabis products to patients unresponsive to conventional prescription treatments.)

“After vaporizing one dose of their prescribed cannabis flower, participants exhibited no significant changes in performance on any of the video-based tasks (hazard perception skill, gap acceptance, following distance or speed) compared to baseline,” investigators reported.

The study’s authors concluded, “The findings … suggest that a dose of vaporized cannabis (consumed in accordance with prescription) may not affect hazard perception ability or driving-related risk-taking behavior among medicinal cannabis patients.”

The study’s findings are consistent with those of several others determining that daily cannabis consumers, and patients especially, exhibit tolerance to many of cannabis’ psychomotor-influencing effects. According to the findings of a literature review published in the journal of the German Medical Association, “Patients who take cannabinoids at a constant dosage over an extensive period of time often develop tolerance to the impairment of psychomotor performance, so that they can drive vehicles safely.”

The US federal DOT already exempts drivers with doctor ordered prescriptions from drug testing for opiods and a whole host of other drugs that show up on drug tests. Medical marijuana can not be far behind based on this study.

Full text of the study, “The acute effects of vaporized cannabis on drivers’ hazard perception and risk-taking behaviors in medicinal patients: A within-subjects experiment,” appears in the Journal of Safety Research. Additional information is available in the NORML Fact Sheet, ‘Marijuana and Psychomotor Performance.’

Courtesy of NORML.org