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Weed and memory: new study reveals how cannabis impairs recall

NCT ID NCT05488509

Knowledge-focused Sponsor: Washington State University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

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

Summary

This study looked at how cannabis affects memory in people who use it regularly. 121 participants inhaled either a low or high dose of cannabis, or a placebo, and then took a series of memory tests. The goal was to see if cannabis makes it harder to remember things like words, pictures, and tasks. The results help us understand the short-term memory effects of cannabis.

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

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

121 people

The number who actually took part.

Started

Aug 2023

Finished

May 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

21 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Have used cannabis at least once a week for at least one year * Willing to abstain from using any cannabis on the day of their scheduled testing session (minimum of 8 hours of abstinence) Exclusion Criteria: * Diagnosis of a serious psychiatric condition (psychosis, bipolar I, panic disorder) * Family history of psychosis * Diagnosis of a neurological disorder * Diagnosis of a chronic medical condition (e.g., heart disease, diabetes) * Diagnosis of a learning disability * History of multiple concussions * History of head injury that may impact cognition * Being pregnant * Lactating * History of adverse experiences with cannabis (anxiety, panic attacks) * Use of illicit drugs in the past 6 months * Heavy alcohol use (\>4 drinks, \>4 times/week) * Smoking/nicotine use * BMI greater than 34

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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 use

Contacts and locations

Locations

  • Washington State University

    Pullman, Washington, 99163, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.