Cannabis brownies and booze: study reveals how they mess with your driving

NCT ID NCT04931095

Completed Knowledge-focused Sponsor: Johns Hopkins University Source: ClinicalTrials.gov ↗

First seen Jun 24, 2026 · Last updated Aug 04, 2026 · Updated 3 times

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.

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).

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.

Alcoholic Intoxication poisoning

As listed by the trial registrant

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

ALCOHOL INTOXICATION CANNABIS INTOXICATION

Contacts and locations

Locations

Johns Hopkins Behavioral Pharmacology Research Unit

Baltimore, Maryland, 21224, United States

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