New study to test if age changes how cannabis affects driving

NCT ID NCT04325958

Recruiting now Knowledge-focused Sponsor: Centre for Addiction and Mental Health Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at how age and how often someone uses cannabis affect driving skills. Researchers will compare young (19-25) and middle-aged (35-45) drivers who use cannabis occasionally or frequently. Participants will smoke a cannabis cigarette or a placebo and then drive in a simulator to measure weaving, speed, and following distance.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Cannabis (marijuana)
What this could lead to: If successful, this study could help understand how age and cannabis use frequency impact driving ability, potentially informing safer driving guidelines.
What could go wrong: This is an early-phase observational study with a small sample (128 participants) using a driving simulator, not real roads. Results may not reflect real-world driving or apply to all users.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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Conditions

The condition(s) this trial relates to.

cannabis dependence

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

CANNABIS

Contacts and locations

Locations

Centre for Addiction and Mental Health
RECRUITING

Toronto, Ontario, M5S 2S1, Canada

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