View clinical trials related to Marijuana Abuse.
Filter by:This study will examine the acute effects of cannabis on various aspects of memory. Eligible participants will complete a drug screen. Participants who pass the drug screen will be asked to wear an Empatica E4 wristband for the duration of the study. Participants will provide a saliva sample from which cortisol will be extracted. They will then complete baseline measures of cannabis consumption patterns, level of intoxication, mood, anxiety, stress, and verbal intelligence. Next, participants will be randomly assigned to inhale vapor from cannabis containing 20mg THC, 40mg THC, or placebo; both cannabis and placebo will be obtained from the National Institute on Drug Abuse (NIDA). Participants will then will complete a battery of memory tests including tests of prospective, verbal, visuospatial, source, verbal working, visuospatial working, false, and temporal order memory. Memory tests will be completed across two blocks in a counterbalanced order. Saliva samples will be obtained two additional times after drug/placebo administration. Ratings of intoxication, mood, anxiety, and stress will be obtained three additional times after drug/placebo administration. The investigators hypothesize that participants who are randomly assigned to inhale cannabis vapor will perform worse on all memory tests than participants who inhale the placebo.
The study will test a computerized treatment with subjects ages 13-17 years who are seeking treatment for alcohol and/or cannabis use. Follow-up assessments will be conducted at one- and three-months following treatment.
The primary goals of this study are to examine 1) marijuana modulation of oxycodone self-administration and 2) oxycodone modulation of marijuana self-administration, under controlled conditions and across a range of doses for each drug.
The main purpose of this study is to determine whether hippocampal synaptic vesicle density estimated by hippocampal [11C]APP-311/[11C]UCB-J binding in individuals diagnosed with cannabis use disorder (CUDs) improves with at least 4 weeks of confirmed abstinence from cannabis, in comparison to healthy controls (HCs). Furthermore, any change in synaptic vesicle density will be placed in functional context by measuring verbal memory, which is sensitive to hippocampal function, before and after at least 4 weeks of confirmed abstinence. Finally, the relationship between hippocampal [11C]UCB-J binding in CUDs with measures of cannabis exposure (e.g., age of initiation, cumulative lifetime dose) will be explored.
The aim of the study is to examine the effect of cannabis use on brain synaptic density among older adults using [11C]UCB-J PET imaging.
To elucidate mechanisms of substance use disorders (SUD) and comorbid mental illnesses in people living with HIV (PLWH), the study team seeks to investigate reward and pain circuitry in cannabis use and depression comorbidity, two highly prevalent conditions in PLWH. The study team proposes a tightly integrative study to test the overall hypothesis that cannabis use and depression in young PLWH have an additive effect, inducing both reward deficits and pain hypersensitivity, and that this pattern will predict worse outcomes at 1 year follow-up.
Cognitive impairment is well established in people with psychosis and is associated with cannabis use. The current study will investigate the neurobiological basis of cognitive change associated with 28-days of cannabis abstinence in people with psychosis and non-psychiatric controls with cannabis use. Participants will be randomized to a cannabis abstinent group or a non-abstinent control group and will undergo magnetic resonance imaging at baseline and following 28-days of abstinence. This study will help characterize the neuropathophysiological processes underlying cognitive dysfunction associated with cannabis use and its recovery which may guide the development of novel interventions for problematic cannabis use.
The aim of the study is to evaluate the effectiveness of long-term and short-term app-based self-guided psychological interventions to reduce craving and lapse risk in problematic behaviors (compulsive sex, pornography, overeating, gaming, gambling) and substance use (cannabis, nicotine). Participants are randomly assigned to either the intervention group or the control. Participants in the intervention group have access to short-term and long-term interventions, whereas those in the control group only have access to the weekly ecological momentary assessment reports. Participants in the intervention group are able to access the intervention materials 5 days after enrollment and receive weekly ecological momentary assessment reports. Those in the control group will be granted access to all intervention materials after five weeks following study enrollment. A questionnaire battery assessments is administered (1) at baseline in the first week following onboarding in; (2) after 5 weeks; (3) after six months. In addition, longitudinal data on several variables related to craving and lapse risk are collected daily using ecological momentary assessment
This study employs novel methods to identify key determinants and consequences of concurrent HIV infection and regular cannabis use. This study will acquire extensive phenotype data from peripheral and brain markers of immune activation, brain structure, and neuropsychological performance (NP) in persons living with HIV (PLWH) receiving combination anti-retroviral therapy (cART) (80 regular cannabis users and 80 non-users) and HIV uninfected (HIV-) controls (80 regular cannabis users and 80 non-users). This study will provide key insights into the effects of regular cannabis and HIV on peripheral and brain markers of immune function and NP in PLWH and HIV- controls. These insights are critical for cure strategies and ongoing HIV treatment initiatives.
This project seeks to learn more about the effects of cannabis use on the endocannabinoid system and endogenous opioid systems in adolescents to address a fundamental gap in knowledge and identify biomarkers that may help distinguish youth who relapse from youth who remain sober.