New study tests how pot and booze mix to impair drivers

NCT ID NCT06293040

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

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This study looks at how using vaporized cannabis and drinking alcohol together affects thinking, coordination, and driving skills. About 90 healthy adults will take part in sessions where they receive different doses of cannabis (THC) and alcohol or placebos. Researchers will measure impairment using cognitive tests, field sobriety tests, and a driving simulator to better understand the risks of combining 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: Cannabis (THC) and Alcohol (Ethanol)
What this could lead to: If successful, this study could provide clearer data on how cannabis and alcohol together impair driving and cognitive skills, potentially informing safety laws and public health advice.
What could go wrong: This is an early-phase lab study with only 90 participants, so results may not apply to real-world use or to everyone. It measures impairment in a controlled setting, not actual crash risk.

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
RECRUITING

Baltimore, Maryland, 21224, United States

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