Effects of stopping cannabis use on thinking and mental health symptoms

Changes in cognition and psychiatric disorder symptoms during cannabis abstinence using a novel discordant twin design

NIH-funded research University of Colorado Denver · NIH-10900781

This study is looking at how taking a break from cannabis affects thinking skills and mental health in adults aged 31 to 47, by comparing twins where one stops using cannabis and the other keeps using it, to see what changes happen over six weeks.

Quick facts

Grant typeNIH-funded research
Study typeNIH-funded research
Funding institutionUniversity of Colorado Denver NIH-funded
Lab location1 site (Aurora, UNITED STATES)
Project IDNIH-10900781 on NIH RePORTER

What this research studies

This research investigates how abstaining from cannabis affects cognitive functions such as memory, attention, and processing speed, as well as psychiatric symptoms in adults aged 31 to 47. The study uses a unique approach by comparing monozygotic twins where one twin abstains from cannabis while the other continues using it. This design allows researchers to control for genetic factors and focus on the environmental impact of cannabis use. Participants will undergo assessments over a six-week period to evaluate changes in their cognitive abilities and mental health symptoms.

Who could benefit from this research

Good fit: Ideal candidates for this research are adults aged 31 to 47 who are regular cannabis users and willing to abstain from cannabis for six weeks.

Not a fit: Patients who do not use cannabis or are not experiencing cognitive or psychiatric symptoms may not benefit from this research.

Why it matters

Potential benefit: If successful, this research could provide insights into the cognitive and mental health benefits of cannabis abstinence, potentially guiding treatment strategies for individuals with cannabis use disorders.

How similar studies have performed: While there have been studies on cannabis use, this specific approach using discordant twins is novel and has not been extensively tested.

Where this research is happening

Aurora, UNITED STATES

Researchers

About this research

  1. This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
  2. Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
  3. For full project details, budget, and progress reports, visit the official NIH RePORTER page below.
Conditions Attention deficit hyperactivity disorder
Last reviewed 2026-06-13 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.