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The effects of medicinal cannabinoids on driving

This is a randomised, double-blind and placebo-controlled crossover study that will investigate the effects of vaporised THC and CBD on driving.

This is a randomised, double-blind and placebo-controlled crossover study that will investigate the effects of vaporised THC and CBD on driving.

The study will explore the idea that CBD content in cannabis plant material will modify the effects of THC on driving, and will investigate the link between concentrations of cannabinoids in blood and saliva, and driving ability. Participants of mixed gender aged 18-50 years will vaporise three varieties of cannabis over three research sessions in a counterbalanced order. In these sessions, participants will complete a driving simulation task as well as a series of cognitive tests. The three varieties of cannabis to be vaporised include a high THC/low CBD strain, a high THC/high CBD strain, and a placebo strain.

Drug testing of saliva and blood will follow current police procedures and a secondary aim of the study is to examine the relationship between positive results on these tests and actual driving impairment, which is currently a very controversial topic in the community and in legal circles. 

This study has human ethics approval number X15-0408 (RPAH).

Eligibility

You may be eligible to participate in this study if you:

  • be aged 18-50
  • have used cannabis before
  • hold an unrestricted Australian drivers license
  • be available to complete three half day sessions (sessions will be run on weekdays)
  • be able to provide blood and saliva samples. 

How to participate

To register your interest for this study, please use the form on this webpage:

https://sydney.edu.au/lambert/our-research/cannabis-use/driving-in-cannabis-users.html