Joint effects: new study tests cannabis and tobacco on the road
NCT ID NCT05526196
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looks at how smoking cannabis and tobacco, alone or together, impacts driving skills, thinking, and blood THC levels. Sixty regular cannabis users will drive a simulator and take cognitive tests after smoking different combinations. The goal is to understand why people mix them and whether tobacco changes cannabis effects on driving.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- cannabis and tobacco
- What this could lead to
- If successful, this study could clarify how tobacco affects cannabis impairment and driving risk, informing public safety guidelines.
- What could go wrong
- This is a small, early-stage lab study with only 60 participants, so results may not apply to all users or real-world driving conditions.
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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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Study contacts
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
Locations
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Centre for Addiction and Mental Health
RECRUITINGToronto, Ontario, M5T 1R8, Canada
Contact Phone: •••-•••-•••• Email: •••••@•••••
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