Can alcohol and cannabis together worsen driving skills more than either alone?
NCT ID NCT03106363
First seen Jul 24, 2026 · Last updated Jul 24, 2026
Summary
This trial investigates how combining alcohol and cannabis affects driving performance in young adults aged 19 to 29. Participants drink alcohol or a placebo and smoke a cannabis or placebo cigarette, then complete driving scenarios on a high-fidelity simulator. The study measures lane control, speed, and other driving-related skills to understand the combined risks of these substances.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- alcohol and cannabis (delta-9-tetrahydrocannabinol) given separately and together
- What this could lead to
- If this trial clarifies how alcohol and cannabis together impair driving, it could inform public safety messages and policies to reduce crash risk in young drivers.
- What could go wrong
- This is a small, early-stage lab study using a driving simulator, not real roads. Results may not fully reflect real-world driving or apply to all age groups.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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Centre for Addiction and Mental Health
Toronto, Ontario, M5S 2S1, Canada