Cannabis dependence

Researchers are testing a Spanish version of CANreduce, a web-based self-help program that uses cognitive behavioral therapy and motivational interviewing to help people reduce their cannabis use. The trial compares three groups: one gets the program plus psychological support, o…

This study tests whether gabapentin, an FDA-approved medication, can help restore the balance of key brain chemicals (GABA and glutamate) in people with bipolar disorder who also use cannabis. Participants are randomly assigned to receive either gabapentin or a placebo for 17 day…

This trial tests whether guanfacine-ER, a medication currently used for ADHD, can help people with cannabis use disorder reduce their cannabis use. Participants will receive either guanfacine-ER or a placebo daily for several weeks, and their cannabis use will be tracked through …

This study tested whether N-acetylcysteine (NAC), an over-the-counter supplement, can help people who use both tobacco and cannabis quit both substances. Fifty-nine regular smokers who also used cannabis took either NAC or a placebo for 8 weeks. Researchers tracked how often they…

This study tested a smartphone app called TECH designed to help court-involved teens reduce or stop using marijuana. The app is a private online community where teens can support each other anonymously. Researchers enrolled 60 teens aged 14-18 who had used marijuana in the past y…

This study tested whether giving adults with chronic pain discounted vouchers for medical cannabis soft-gel capsules could help them reduce their opioid painkiller use. 270 participants were randomly assigned to receive vouchers for placebo or cannabis capsules with different THC…

This pilot study tested a counseling program called the Teen Marijuana Check Up, adapted for young adults (ages 13–35) who have early psychosis and use cannabis. The program uses motivational interviewing and personalized feedback over two sessions to help participants reduce or …

This study looked at whether people with HIV who regularly use cannabis could stop for 28 days and whether that would improve their mood, pain, sleep, and HIV viral load. Twenty-five participants were given financial incentives to stay cannabis-free, with urine tests to confirm. …

About 25% of people who have knee replacement surgery develop persistent pain that can last for months. This trial tests whether taking a CBD-dominant oil before and after surgery can reduce that risk. Researchers will randomly assign about 40 adults to receive either CBD oil or …

This study tested whether a lifestyle physical activity program, using a Fitbit tracker and coaching calls, could help pregnant women at risk for cannabis use reduce their use. Sixteen women who used cannabis at least weekly before pregnancy and had mild depression or anxiety too…

This trial tests a school-based curriculum called Smart Talk, designed to reduce cannabis use and intentions among middle and high school students. Over five lessons, the program targets misperceptions, refusal skills, stress, and coping. Researchers will measure whether students…

Researchers at Yale University developed a virtual reality game called Invite Only VR to help middle school students learn about the risks of vaping nicotine and cannabis. In the game, players practice refusing offers to vape in realistic social situations. The study tested the g…

This study tests whether adding trauma-informed coping strategies and peer coaching to a standard mobile brief intervention helps young adults (ages 18-25) who drink heavily and have experienced interpersonal trauma reduce their alcohol use. 225 college students will be randomly …

This pilot study tested an oral cannabinoid oil (CBD with a small amount of THC) in 51 adults with chronic pain. The goal was to see if it's practical to run a larger trial and to gather early data on pain relief and safety. Participants took the oil daily for up to 12 weeks, and…

This early-phase trial is testing whether a generative AI chatbot called Therabot-CALM is usable and acceptable for people with cannabis use disorder who also have anxiety or depression. Fifteen participants will use the app for 4 weeks and give feedback through interviews and su…

This study tests whether inhaling medical cannabis three times a day can safely reduce pain in people with diabetic peripheral neuropathy. 122 adults will receive either a low, medium, or high dose of THC or a placebo using a special inhaler. The main goal is to see if pain score…

This study tests four virtual coaching sessions to help veterans with chronic pain use their own cannabis products more effectively. Participants will learn strategies to manage pain and related symptoms. The goal is to see if this coaching improves pain relief and satisfaction.

This study looked at whether adding medical cannabis to a behavioral program helps adults with long-term non-cancer pain lower their opioid dose and manage pain better. 87 participants on stable, high-dose opioids were randomly assigned to either start medical cannabis or not, wh…

This small pilot study tested a culturally adapted group therapy called Emotional Awareness and Expression Therapy (EAET) in 6 Israeli adults with chronic musculoskeletal pain who also use medical cannabis. The goal was to see if the therapy could reduce pain and improve emotiona…

This early-phase trial tested whether deep transcranial magnetic stimulation (dTMS) targeting specific brain regions is safe and tolerable for people with moderate-to-severe cannabis use disorder. Twelve adults who used cannabis at least four days per week received the stimulatio…

This study looked at a community-based program in Norway that helps people stop using cannabis. The program combines cognitive therapy and education over about 8 weeks. 102 people took part, and researchers measured changes in cannabis use, mental distress, and well-being right a…

This small pilot study tested whether cannabis oil (with different ratios of CBD to THC) could help with insomnia in people who also have major depression. Fourteen adults took either a high-CBD oil, a low-CBD oil, or a placebo for a short time. The main goal was to see if a larg…

This pilot study tested a mobile app called iCanChange in 100 young adults (ages 18-35) with psychosis and cannabis use disorder. The app uses motivational interviewing and cognitive behavioral therapy techniques through short interactive modules. The main goal was to see if the …

This study tested whether CBD (a compound from cannabis) can help people who want to reduce their pain and opioid use. 126 adults took either CBD or a placebo for 12 weeks. Researchers measured changes in pain, opioid use, and other factors like anxiety and sleep.

This study looked at whether medical cannabis can reduce nerve pain and inflammation in people with HIV. Thirty-five adults with HIV and neuropathic pain used different ratios of THC and CBD over 14 weeks. Researchers measured changes in pain severity and blood markers of inflamm…

This study looks at how the labels and marketing claims on cannabis products affect what people think about the product's risks and effects. About 2,000 adults in states where recreational cannabis is legal will answer online survey questions after viewing a cannabis advertisemen…

This completed study looked at how genes influence addiction and related behaviors. Researchers collected blood samples and had 847 adults (healthy volunteers, smokers, drug users, and people with psychiatric disorders) complete questionnaires and computer tasks. The goal was to …

Researchers are studying how a full-spectrum medicinal cannabis plant extract with very low THC, called NTI164, moves through the body of healthy adult volunteers. The trial measures how much of the drug reaches the bloodstream and how much leaves the body in urine over up to 28 …

This study looks at how different warning labels on cannabis edibles packaging change what people know, how safe they think the product is, and whether they want to try it. About 1,250 adults in the U.S. will view packages with different warnings and answer questions. The goal is…

This study uses identical twins who both use cannabis to see if quitting for 42 days improves memory, attention, and mental health symptoms. One twin is paid to stop using cannabis, while the other continues as usual. Researchers will compare changes in thinking skills and mood b…

This study gives people with Cannabis Use Disorder drugs that mimic stress to see how it affects their desire for cannabis. Researchers measure brain activity and decision-making during four lab visits. The goal is to understand the link between stress and cannabis use motivation…

This study explores whether compounds in cannabis, like THC and CBD, can reduce inflammation and improve how the body responds to insulin. Researchers will measure blood markers of inflammation and insulin sensitivity in people across the weight spectrum, both after a single use …

This study investigates how three weeks of cannabis abstinence influences brain responses to threat, reward, and cannabis cues in women with cannabis use disorder. Participants are randomly assigned to either continue using cannabis as usual or abstain for three weeks, with lab v…

This trial investigates whether smoking or vaping cannabis increases the frequency of premature atrial and ventricular contractions — early or extra heartbeats that can feel like skipped beats. Over 14 days, regular cannabis users will be randomly assigned to consume or avoid can…

This study tested 30 healthy adults to see how Delta-8-THC and Delta-9-THC affect driving in a simulator. Participants took the drugs by vaping or eating, then performed driving and sobriety tests. The goal is to understand how Delta-8 impairs driving compared to Delta-9, helping…

This study tests whether suvorexant (Belsomra), a sleep medication, can lower brain activity linked to cannabis cravings. Twenty adults who use cannabis daily will take the drug for 14 days and undergo brain scans before and after. The goal is to see if the medication reduces the…

This study looks at 65 veterans with PTSD who use cannabis frequently. Researchers want to see if reducing cannabis use improves their daily functioning, mental health, and quality of life. No treatment or drug is given—participants simply report their cannabis use and well-being…

This study investigates whether chronic cannabis use impairs contrast sensitivity — the ability to see objects clearly against their background, especially when they are moving. Researchers will compare three groups: cannabis addicts, tobacco-only smokers, and non-smokers. Partic…

This study combined brain imaging with real-world data from mobile devices to explore how addiction affects the brain. Researchers scanned the brains of 107 people with alcohol, cannabis, or nicotine dependence, along with healthy controls. They also tracked cravings and daily fu…

This study looked at how different labels on vaping devices (like 'contains nicotine' or 'high potency') affect teens' interest in trying them, their views on health risks, and what effects they expect. Over 3,000 high school students viewed images of vaping devices with various …

This observational study looked at how legal cannabis use changes alcohol drinking habits, gut bacteria, and brain function in people who regularly use both alcohol and cannabis. 77 heavy drinkers who also smoke cannabis took part, providing blood and stool samples and completing…

This study looked at how different types of cannabis affect memory and brain waves in 96 healthy adults who use cannabis regularly. Participants did a memory task after smoking cannabis and again on a sober day, while their brain activity was recorded with EEG. The goal was to se…

This study looked at how two hormones that rise during pregnancy—estradiol and cortisol—affect the way the body breaks down THC, the main active ingredient in cannabis. Fourteen healthy women of childbearing age took part. Researchers measured THC levels in the blood after taking…

This study looked at how smoking marijuana with different levels of THC affects alcohol cravings and drinking in people who are heavy drinkers and also use marijuana. 157 participants were given either a high-THC, moderate-THC, or placebo marijuana cigarette, then their alcohol c…

This completed Phase 1 study looked at how marijuana and an opioid drug influence each other's use in healthy adults aged 18-50 who had experience with both substances. Eight participants lived at a research unit for about 6.5 weeks and could earn doses of each drug under control…

This completed study looked at how regular cannabis use affects brain health and thinking skills in people with HIV and those without. Researchers used brain scans, blood and spinal fluid tests, and thinking tasks to compare 276 participants. The goal was to understand the combin…

This completed study from the University of Hong Kong looked at 110 cannabis users aged 16-60 to see how their thinking skills change over time and if genes play a role. Participants took memory and thinking tests and gave blood for genetic analysis. The goal is to understand lon…

This completed Phase 1 study at UCLA looked at how smoking cannabis with different amounts of THC and CBD affects drug levels in oral fluid and blood, as well as thinking and feeling. Nineteen adults who use cannabis occasionally took part. The goal was to better understand how t…

This study tested a program called CRAFT-EP, which helps families support a relative with early psychosis and substance use (like alcohol or cannabis). The program was delivered entirely through video calls. Researchers measured family members' depression and anxiety to see if th…

This study looked at whether cannabis use affects sperm quality in infertile men. Researchers compared sperm samples from 71 men who used cannabis and those who did not. They measured sperm DNA health and other factors to see if cannabis might be linked to fertility problems.

This study looked at how a pill form of THC (dronabinol) affects sleep and thinking in 18 adults. Some participants used cannabis frequently (more than 3 times a week), while others rarely used it (less than 10 times ever). Researchers measured sleep stages, alertness, memory, an…

This study looked at 40 people who used cannabis within a month before surgery. Researchers used a bedside ultrasound to measure stomach contents and volume, checking if cannabis use leads to delayed stomach emptying. The goal was to better understand how cannabis might affect su…

This study looked at whether cannabis or a similar drug (dronabinol) can improve brain reward function in people with schizophrenia who also use cannabis. 263 participants took part to see if these substances help regulate brain circuits linked to motivation and pleasure. The goa…

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, pi…

This study looked at how drinking alcohol and using high-THC cannabis concentrates together affects people. 146 heavy drinkers who also use cannabis regularly took part. Researchers measured things like blood alcohol level, heart rate, and how impaired they felt, depending on whe…

This study looked at how sex hormones and gender influence recovery from cannabis use disorder. 224 adults who wanted to cut down on cannabis received 8 weeks of counseling, including one-on-one goal setting and computerized therapy. They also provided daily saliva samples to tra…

This study looked at how cannabis use affects brain receptors and electrical activity, and how these change when people stop using. Researchers used brain scans and EEGs in 162 people, including cannabis users and healthy controls. The goal was to understand the brain's recovery …

This early-phase study with 5 adults looked at how two cannabis compounds (delta-9-THC and delta-8-THC) affect driving ability. Participants took the compounds and then used a driving simulator and field sobriety tests. The goal was to see if it's possible to measure impairment a…

This study, completed by Yale University, tested whether a standardized field test can measure marijuana impairment in drivers. 41 participants who use marijuana regularly completed cognitive tasks and simulated driving after smoking either medium-THC or placebo marijuana. The go…