Cannabis dependence

This study tests a medicine called tirzepatide to see if it can help people with moderate to severe cannabis use disorder use less cannabis or stop altogether. One hundred adults aged 18 to 70 will receive either the drug or a placebo, and researchers will track their cannabis us…

This study will test whether living in a self-contained, AI-managed community (called a Microcity) can improve mental health and reduce addiction in adults with conditions like autism, ADHD, substance use disorders, and behavioral addictions. Up to 1 million participants will liv…

Researchers are testing whether lemborexant, a sleep medication, can help people with moderate to severe cannabis use disorder cut back on cannabis, improve sleep, and ease withdrawal symptoms. The trial compares 21 nights of lemborexant against a placebo, with participants also …

This trial explores whether adding a gentle brain stimulation technique called transcranial alternating current stimulation (tACS) to a brief counseling session can help adults with cannabis use disorder. The counseling, known as motivational interviewing, helps people talk throu…

This trial tests whether varenicline, a medication already used to help people quit smoking, can reduce marijuana use in adults with cannabis use disorder. Participants will take either varenicline or a placebo for 12 weeks, alongside computerized cognitive behavioral therapy. Th…

This study will test whether cannabis can reduce the severity of opioid withdrawal and make opioid use safer. One hundred adults with opioid use disorder will live in a hospital for about six weeks. Researchers will give them cannabis and a small dose of opioids to see how their …

This trial investigates whether pregnenolone, a natural neurosteroid, can help adults who struggle with both cannabis use disorder and major depression. The study involves a small group of 20 participants aged 18 to 50 who use cannabis frequently and want to cut back. Researchers…

This 12-week study tests whether a weekly injection of tirzepatide, a drug used for diabetes, combined with motivational therapy can help adults with moderate to severe cannabis use disorder. Fifteen participants will receive escalating doses of tirzepatide along with counseling.…

This study tests whether cannabis-based treatments can safely reduce seizures in people aged 2 to 55 with drug-resistant epilepsy. Participants will receive either a pure CBD extract, a CBD-rich herbal cannabis extract, or a placebo. The goal is to see if these treatments lower m…

This pilot study tests whether repetitive transcranial magnetic stimulation (rTMS) can strengthen a brain circuit linked to staying away from cannabis. Fifty treatment-seeking youth aged 15–21 with cannabis use disorder will receive either real or sham rTMS. Researchers will chec…

This pilot study tests whether tirzepatide, a drug used for diabetes, can reduce cravings in people with severe cannabis use disorder. Six adults will receive either tirzepatide or a placebo injection and then be exposed to cannabis-related cues to measure craving intensity. The …

This study tests a talking therapy called the Cannabis Clinic for Psychosis (CCP) to help people with first-episode psychosis reduce or stop cannabis use. The therapy includes motivational interviewing and cognitive behavioral therapy in weekly sessions over 12 weeks. Researchers…

This study tests LaunchPad, an online program designed to help high school seniors avoid drug and alcohol problems as they leave school. Researchers will randomly assign 5,000 students to different lessons and measure changes in their attitudes, confidence, and intentions around …

Researchers at the University of Michigan are testing a remote program for adults with cannabis use disorder. Participants receive six telemedicine sessions that blend motivational coaching with small incentives for staying engaged. The study compares this approach with enhanced …

Researchers are testing two mobile app-based programs, CHAMPS and iCanChange, for young adults with first-episode psychosis who use cannabis. CHAMPS targets safer use for people not looking to quit, while iCanChange supports those who want to reduce or stop. The trial compares ea…

This study tests a cannabis plant extract called NTI164, which has very low THC (the compound that causes a high), in 40 females aged 4-25 with Rett syndrome, a rare genetic condition causing severe physical and mental challenges. Participants will receive either NTI164 or a plac…

This study tests whether a full-spectrum cannabis plant extract called NTI164 can help reduce core autism symptoms (like social challenges and repetitive behaviors) in children and young adults aged 6 to 25. About 98 participants will receive either NTI164 or a placebo for 16 wee…

This study tests whether inhaling high-THC cannabis can safely reduce PTSD symptoms in 320 veterans. Participants will either receive active cannabis or a placebo with almost no THC. The goal is to see if cannabis helps with PTSD severity and daily functioning, providing real-wor…

This study tests whether personalized feedback, based on real-time data from smartphones and wearable devices, can help Veterans with PTSD who use cannabis. The feedback aims to show how PTSD symptoms, cannabis use, and daily behaviors like sleep and activity are connected. The g…

This study tests whether a behavioral method called Emotional Brain Training (EBT) can help people in recovery from addiction manage stress, anxiety, and cravings. About 54 adults receiving standard addiction treatment will either continue their usual care or also attend weekly E…

This study tests whether a high-CBD cannabis extract is safe and helps relieve symptoms in people with moderate to severe restless legs syndrome (RLS). About 60 adults aged 18-79 will receive either the CBD extract or a placebo for several weeks. Researchers will track side effec…

Researchers at the Medical University of South Carolina are studying whether THC, the main psychoactive compound in cannabis, affects the brain's reward system differently in men and women who use cannabis regularly. About 78 adults aged 21 to 45 who use cannabis at least four da…

This study develops and pilot tests a written 'practice companion' designed to help clinicians and other trusted adults provide developmentally appropriate substance use care to youth ages 14 to 24. The companion offers practical guidance on cannabis, opioids, and other substance…

This study compares the immediate effects of inhaling cannabis (either smoked or vaporized) versus tobacco cigarettes on lung health. Researchers will measure breath biomarkers—such as exhaled nitric oxide, volatile organic compounds, and other substances—to see how each substanc…

This study will test whether cannabis can reduce the desire to take opioids in people with opioid use disorder. Thirty participants will live in a hospital for six weeks and receive either cannabis or a placebo, along with opioids. Researchers will measure how many times particip…

This study looks at how different doses of THC (the active ingredient in cannabis) affect eye movements and attention. Researchers will test 40 adults—some who use cannabis often and some who use it rarely—to see if eye-tracking can reliably detect impairment. The goal is to deve…

This study looks at how using nicotine vapes before or after THC vapes changes the amount of THC that enters the bloodstream. Researchers will compare THC levels and effects in 60 adults who regularly use both products. The goal is to understand safety and how these products work…

This study aims to find out which cannabis warning messages are most effective at raising awareness and changing perceptions. Researchers will show US adults (both users and non-users) seven different warning messages covering topics like dependence, cognitive function, and cardi…

This study will test 35 people with known or suspected allergies to cannabis, tree nuts, or seeds to see if they are also allergic to hemp seeds. Participants will receive skin prick tests and blood tests to measure allergic reactions. The goal is to understand the potential alle…

This study aims to improve a short motivational conversation to help young adults (ages 18-25) who were injured in an assault and also misuse alcohol or cannabis. Researchers will interview and survey 50 participants from a hospital violence intervention program to understand how…

This study looks at how a moderate dose of THC (the active part of cannabis) affects mood, stress, and thinking in people who use cannabis at least once a week. Ninety adults will take part in two sessions—one with active cannabis and one with a placebo—without knowing which they…

This study will follow 120 people with schizophrenia who use cannabis, using mobile phone surveys and thinking tasks to track symptoms in real time. The goal is to understand how cannabis may both worsen positive symptoms (like hallucinations) and reduce negative symptoms (like l…

This study looks at whether cannabidiol (CBD) can reduce the amount of THC heavy cannabis users need to feel intoxicated. About 30 adults who use cannabis heavily will take a single dose of CBD or a placebo, then inhale THC using a vaporiser and decide when they've had enough. Re…

This study tests whether a brief education session about cannabis risks can increase knowledge and motivation to reduce use among people with eating disorders. 80 patients will receive either cannabis education or sleep hygiene education during their first week of a 20-week eatin…

This study looks at how different amounts of oral THC (the main psychoactive ingredient in cannabis) affect mood, heart rate, and drug feelings in healthy adults who have used cannabis before. Participants will take either a low, medium, or high dose of THC or a placebo during fo…

This study will give 80 healthy adults who use cannabis occasionally different low doses of inhaled CBD (5 to 100 mg) or a placebo to see if they feel a pleasant effect. Each person will try all doses in a random order, and researchers will also explore if current tools miss any …