Cannabis brownies and booze: study reveals how they mess with your driving
NCT ID NCT04931095
First seen Jun 24, 2026 · Last updated Jun 24, 2026
Summary
This study looked at how eating cannabis (in a brownie) and drinking alcohol, alone or together, affects people's ability to think clearly, stay coordinated, and drive safely. Sixty healthy adults aged 21 to 55 took part in a controlled lab setting. Researchers measured impairment using driving simulators, sobriety tests, and thinking tasks to understand the combined effects.
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This is a summary of
the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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Johns Hopkins Behavioral Pharmacology Research Unit
Baltimore, Maryland, 21224, United States
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Cannabis (in a brownie) and alcohol (in a flavored drink)
What this could lead to
If successful, this could help set clearer guidelines for how long people should wait after using cannabis or drinking before driving.
What could go wrong
This was a small, early-phase lab study with 60 healthy adults, so results may not apply to everyone or to real-world cannabis use (e.g., smoking).
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.