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Neural Hyperactivity During Value-Based Decision-Making In People With Daily/Near Daily Cannabis Use, Miranda Ramirez

Theses and Dissertations--Psychology

Value-based decision-making involves the coordinated effort of multiple brain regions to guide future choices based on past experiences. These processes are disrupted in cannabis use disorder, where individuals continue to use cannabis despite negative consequences. Reinforcement learning (RL) paradigms can be used to capture changes in the value of available options and may inform how the brain is impacted by frequent cannabis use. This study combined fMRI with behavioral modeling of probabilistic choice task data to compare value-based choices between young adults reporting daily/near daily cannabis use (CAN) and controls (CTRL). Participants selected one of two options reinforced ($0.25) at …

A Case Of Cannabis Smoking Induced Leukocytosis, Ramiro A. Rodriguez Jr., Rukayat Akande, Nevin Varghese

Research Colloquium

Background: Leukocytosis relates to infections, malignancies, stress response, and multiple intoxicants. Like other intoxicants, cannabis smoking can result in a persistent leukocytosis. Here we report a case of cannabis-induced leukocytosis.

Case Presentation: A 20-year-old Hispanic female with a history of anxiety disorder presented with 3-days of nausea, vomiting, and colicky abdominal pain. She endorsed heavy marijuana smoking as self-medication and compulsive hot showers for symptom relief. She was admitted for oral intake intolerance, concerning for cannabis hyperemesis syndrome. Her history demonstrated multiple admission for cannabis hyperemesis syndrome during which she demonstrated a leukocytosis which improved with abstinence of marijuana. Her …

Adolescent Use And Co-Use Of Tobacco And Cannabis In California: The Roles Of Local Policy And Density Of Tobacco, Vape, And Cannabis Retailers Around Schools, Georgiana Bostean, Anton M. Palma, Alison A. Padon, Erik Linstead, Joni Ricks-Oddie, Jason A. Douglas, Jennifer B. Unger

Sociology Faculty Articles and Research

Adolescent tobacco use (particularly vaping) and co-use of cannabis and tobacco have increased, leading some jurisdictions to implement policies intended to reduce youth access to these products; however, their impacts remain unclear. We examine associations between local policy, density of tobacco, vape, and cannabis retailers around schools, and adolescent use and co-use of tobacco/vape and cannabis.

We combined 2018 statewide California (US) data on: (a) jurisdiction-level policies related to tobacco and cannabis retail environments, (b) jurisdiction-level sociodemographic composition, (c) retailer locations (tobacco, vape, and cannabis shops), and (d) survey data on 534,176 middle and high school students (California Healthy Kids …

Cannabis Cues And Effects On Social Anxiety, Erica Steinberg

All Master's Theses

Prior research has shown that individuals experiencing social anxiety may use cannabis for self-medication; therefore, the current study evaluated if viewing cannabis cues would reduce feelings of social anxiety. Central Washington University undergraduates enrolled in psychology courses (n = 124; 66.7% female; M_age = 19.8, SD_age = 4.7) were shown cannabis cues after viewing expressive facial images that prior research has shown induces feelings of social anxiety. Contrary to prior research, the current study found that emotional faces did not significantly affect state-trait anxiety as measured by the 6-item State-Trait Anxiety Inventory (STAI-6) but that trait social …

Changes In Mental Health As A Predictor Of Cannabis Coping Motives And Consequences: Examining The Impact Of Covid-19 Among College Students, Rebecca Dunaief, Adrian Jorge Bravo, James Henson

Psychology Faculty Publications

Objective: Cannabis use is common among college students and many students use cannabis to cope with negative affect. The COVID-19 pandemic was a particularly stressful time for college students. Subsequently, the present study compared college students who reported increases in anxiety/depression symptoms since COVID-19 stay at home orders to those who reported no change in anxiety/depression symptoms on cannabis coping motives, use frequency, and negative consequences. Specifically, we examined whether self-reported changes (i.e., group that indicated increases) in poor mental health during COVID-19 were associated with problematic cannabis use via higher cannabis coping motives. Method: College students (analytic n = …

Associations Between Cannabis, Psychosis, And Schizophrenia In Adolescents, Lauren Moment

Academic Leadership Journal in Student Research

The effects of cannabis use on the brain, mind, and body have been studied for decades. The developing brain, particularly the adolescent and young adult brain, undergoes critical development that makes it especially susceptible to the effects of cannabis use. Among the adverse effects of cannabis use in adolescence and young adulthood, psychosis and psychotic disorders (e.g., schizophrenia) have been examined. The association of cannabis use with schizophrenia was first elucidated in a Swedish study of army conscripts. Specifically, conscripts reported their cannabis use exposure and were followed longitudinally to assess the emergence of schizophrenia. The authors found that those …

A Call For Prudent Taxation Of Cannabis Corporates To Fund Mental Health Programmes, Cyprian Mostert, Jasmit Shah, Lukoye Atwoli, Zul Merali, Manasi Kumar

Brain and Mind Institute

Cannabis consumption increases the incidence of psychotic disorders, violence, and cognitive impairments [1]. Governments need to implement progressive tax legislation, such as that which requires the cannabis sector to accept responsibility and account for its contribution to the worsening of these mental health conditions in developing countries. Excise taxes are rarely imposed on the cannabis sector [2], despite the lucrative wealth amassed by this industry. For example, current estimates show that the global cannabis sector was valued at $25 billion in 2021 and is projected to reach $176 billion by 2030, driven solely by cannabis inhalation demands [3]. The projected …

Review Of Cannabis Use Among Aboriginal And Torres Strait Islander People, Julia Butt, Mandy Wilson, Jocelyn Jones, Simon Lenton

Journal of the Australian Indigenous HealthInfoNet

The health effects of cannabis use may not always be seen as a high priority for Aboriginal and Torres Strait Islander communities. However, the impact of cannabis use on physical and mental health can have significant consequences. It is known that the use of high potency cannabis has increased over the last two decades, with a corresponding increased risk to health. In particular, young people are at increased risk of experiencing harms to mental health. Physical harms to health include effects on the respiratory system, cardiovascular system, an increased risk of cancer, and in-utero effects from maternal use. The review …

Search For The Cause Of Vaping Associated Lung Injury In Adolescents, Alexandra E. Krueger

All Graduate Theses, Dissertations, and Other Capstone Projects

In August 2019 an unexplained, exponential rise in severe respiratory illnesses in previously healthy young adults, swept across America catching the attention of medical providers. Hospital admissions for lung injury increased 10-fold over two months’ time leaving practitioners scrambling for answers. All affected patients were found to have used e-cigarettes prior to symptoms and endorsed using nicotine and marijuana vape pens. The medical community quickly began to search for the cause of these vaping associated lung injuries. Understanding the mechanism of injury is important in order to assist in educating the public about the risks associated with e-cigarettes. The aim …

Trends And Associated Factors Of Use Of Opioid, Heroin, And Cannabis Among Patients For Emergency Department Visits In Nevada: 2009–2017, Pearl C. Kim, Ji Won Yoo, Chris R. Cochran, Seong Min Park, Sungyoun Chun, Yong-Jae Lee, Jay J. Shen

School of Medicine Faculty Publications

To examine trends and contributing factors of opioid, heroin, and cannabis-associated emergency department (ED) visits in Nevada. The 2009 to 2017 Nevada State ED database (n = 7,950,554 ED visits) were used. Use of opioid, heroin, and cannabis, respectively, was identified by the International Classification of Diseases, 9th & 10th Revisions. Three multivariable models, one for each of the 3 dependent variables, were conducted. Independent variables included year, insurance status, race/ethnicity, use of other substance, and mental health conditions. The number of individuals with opioid, heroin, cannabis-associated ED visits increased 3%, 10%, and 23% annually from 2009 to 2015, particularly …

Is There Less Opioid Abuse In States Where Marijuana Has Been Decriminalized, Either For Medicinal Or Recreational Use? A Clin-Iq, Aaron M. Wendelboe, Richard Mathew, Tana Chongsuwat, Elizabeth Rainwater, Mark A. Wendelboe, Elizabeth Wickersham Md, Ann F. Chou

Journal of Patient-Centered Research and Reviews

Opioid use, abuse, and associated mortality have reached an epidemic level. In some states, cannabis is being used to treat chronic pain. To examine the hypothesis that medical marijuana legislation may reduce adverse opioid-related outcomes if patients substitute cannabis for opioids for pain management, we conducted a clinical inquiry (Clin-IQ). We searched Ovid MEDLINE, Ovid MEDLINE In-Process, and Embase for studies using the search terms marijuana, cannabis, legal, marijuana smoking, medical marijuana, opioid-related disorders, cannabis use, medical cannabis, legal aspect, and opiate addiction. We included population-based articles published from January 1, 2012, through December 5, 2018, that assessed the relationship …

Patterns Of Problem Behaviours Among A Representative Sample Of Youth In Ontario, Chantal Williams

Electronic Thesis and Dissertation Repository

Behavioural addictions among adolescents are becoming a growing public health concern. It is well established that problem behaviours, particularly substance use behaviours, tend to cluster together. Some research indicates that gambling is associated with substance use, aligning with Problem Behaviour Theory, which suggests that problem behaviours stem from an underlying disposition toward deviance. This study sought to assess whether a) behavioural addictions, including gambling, video gaming and technology use, cluster together and with substance use and b) profiles of problem behaviours are associated with age, race, socioeconomic status, grade achievement, school connectedness, and antisocial behaviour in the total sample and …

Driving While High, Page D. Dobbs, Michael Smith, David T. Rolfe

All Faculty Scholarship for the College of Education and Professional Studies

As of May 2019, ten U.S. states and Washington DC have legalized non-medical/recreational use of cannabis. With increased access to legal marijuana across the country, some have raised concerns regarding unintended implications of these policies, such as the risk of motor vehicle crashes, which is the leading cause of mortality and injury among youth and young adults. Driving under the influence of marijuana is particularly concerning among young adults and college students, due to the increased level of substance use reported during the transition from high school to post-high school environments, such as college.

Cannabidiol And The Remainder Of The Plant Extract Modulate The Effects Of Δ9-Tetrahydrocannabinol On Fear Memory Reconsolidation, Anthony Murkar, Pam Kent, Christian Cayer, Jon James, Tony Durst, Zul Merali

Brain and Mind Institute

Background: Δ9-Tetrahydrocannabinol (THC, a CB1 receptor agonist) and Cannabidiol (CBD, a non-competitive antagonist of endogenous CB1 and CB2 ligands) are two primary components of Cannabis species, and may modulate fear learning in mammals. The CB1 receptor is widely distributed throughout the cortex and some limbic regions typically associated with fear learning. Humans with posttraumatic disorder (PTSD) have widespread upregulation of CB1 receptor density and reduced availability of endogenous cannabinoid anandamide, suggesting a role for the endocannabinoid system in PTSD. Pharmacological blockade of memory reconsolidation following recall of a conditioned response modulates the expression of learned fear and may represent …

Mental Health Symptom Severity In Cannabis-Using And Non-Using Veterans With Probable Ptsd, Matthew J. Johnson, John D. Pierce, Shahrzad Mavandadi, Johanna Klaus, Diana Defelice, Erin Ingram, David W. Oslin

Rowan-Virtua Research Day

BACKGROUND:

Posttraumatic Stress Disorder (PTSD) is a disabling illness suffered by many veterans returning from war. Some veterans believe that cannabis may be therapeutic for PTSD. The purpose of this study was to better understand the association between cannabis use and PTSD symptoms.

METHODS:

The study was a matched case-control cross-sectional evaluation of the psychiatric and sociocultural associations of cannabis use in veterans with probable PTSD. Patient self-report measures were examined comparing cannabis users (cases) to non-users (controls) who were case-matched on age and gender.

RESULTS:

Results indicated that there were no significant differences between cases and controls in mean …

Cannabinoid Hyperemesis Syndrome: An Unrecognized Cause Of Nausea And Vomiting, Tiffany Smith, Anne Walsh, Christopher Forest

Physician Assistant Studies Faculty Articles and Research

Cannabis has long been used for medical and recreational purposes because of its antiemetic, analgesic, and mood effects. Ironically, chronic use of cannabis can result in paradoxical effects, including a condition known as cannabinoid hyperemesis syndrome. Patients with this syndrome often are seen in the ED with cyclic vomiting, nausea, and epigastric pain. Although the definitive treatment of cannabinoid hyperemesis syndrome is discontinuing the causative agent, medical management that includes rehydration is important to prevent complications. Common antiemetic medications are ineffective, but some studies have shown haloperidol and lorazepam to be effective in treating acute symptoms.

Prescreening Recommendations For Patients On Medical Cannabis, Wen Chieh Hu

Walden Dissertations and Doctoral Studies

Marijuana is the most frequently used illegal substance in the United States and is most widely used among young people aged 12 to 21 years. Accurate screening and monitored issuance of medical cannabis recommendations have been shown to decrease abuse rates of the substance, create fewer deaths from opiates, reduce crime rates, reduce marijuana use in youths, decrease car crash deaths, and lessen prevalence of suicide in young men. The purpose of this project was to explore whether multiple screening methods for depression and anxiety in patients who seek medical cannabis referrals for anxiety and depression would improve screening and …

A Randomized Placebo-Controlled Trial Of N-Acetylcysteine For Cannabis Use Disorder In Adults, Kevin M. Gray, Susan C. Sonne, Erin A. Mcclure, Udi E. Ghitza, Abigail G. Matthews, Aimee L. Mcrae-Clark, Kathleen M. Carroll, Jennifer S. Potter, Katharina Wiest, Larissa J. Mooney, Albert Hasson, Sharon L. Walsh, Michelle R. Lofwall, Shanna Babalonis, Robert W. Lindblad, Steven Sparenborg, Aimee Wahle, Jacqueline S. King, Nathaniel L. Baker, Rachel L. Tomko, Louise F. Haynes, Ryan G. Vandrey, Frances R. Levin

Behavioral Science Faculty Publications

Background—Cannabis use disorder (CUD) is a prevalent and impairing condition, and established psychosocial treatments convey limited efficacy. In light of recent findings supporting the efficacy of N-acetylcysteine (NAC) for CUD in adolescents, the objective of this trial was to evaluate its efficacy in adults.

Methods—In a 12-week double-blind randomized placebo-controlled trial, treatment-seeking adults ages 18–50 with CUD (N=302), enrolled across six National Drug Abuse Treatment Clinical Trials Network-affiliated clinical sites, were randomized in a 1:1 ratio to a 12-week course of NAC 1200 mg (n=153) or placebo (n=149) twice daily. All …

Comparing Adult Cannabis Treatment-Seekers Enrolled In A Clinical Trial With National Samples Of Cannabis Users In The United States, Erin A. Mcclure, Jacqueline S. King, Aimee Wahle, Abigail G. Matthews, Susan C. Sonne, Michelle R. Lofwall, Aimee L. Mcrae-Clark, Udi E. Ghitza, Melissa Martinez, Kasie Cloud, Harvir S. Virk, Kevin M. Gray

Center on Drug and Alcohol Research Faculty Publications

Background—Cannabis use rates are increasing among adults in the United States (US) while the perception of harm is declining. This may result in an increased prevalence of cannabis use disorder and the need for more clinical trials to evaluate efficacious treatment strategies. Clinical trials are the gold standard for evaluating treatment, yet study samples are rarely representative of the target population. This finding has not yet been established for cannabis treatment trials. This study compared demographic and cannabis use characteristics of a cannabis cessation clinical trial sample (run through National Drug Abuse Treatment Clinical Trials Network) with three nationally …

Impact Of Cannabis Use On Treatment Outcomes Among Adults Receiving Cognitive-Behavioral Treatment For Ptsd And Substance Use Disorders, Lesia M. Ruglass, Alina Shevorykin, Vanja Radoncic, Kathryn M. Z. Smith, Philip H. Smith, Isaac R. Galatzer-Levy, Santiago Papini, Denise A. Hien

Publications and Research

Background: Research has demonstrated a strong link between trauma, posttraumatic stress disorder (PTSD) and substance use disorders (SUDs) in general and cannabis use disorders in particular. Yet, few studies have examined the impact of cannabis use on treatment outcomes for individuals with co-occurring PTSD and SUDs. Methods: Participants were 136 individuals who received cognitive-behavioral therapies for co-occurring PTSD and SUD. Multivariate regressions were utilized to examine the associations between baseline cannabis use and end-of-treatment outcomes. Multilevel linear growth models were fit to the data to examine the cross-lagged associations between weekly cannabis use and weekly PTSD symptom severity and primary …

Pharmacology Of Cannabis, Mandakini Sadhir

Pediatrics Faculty Publications

Cannabis has been used for recreational purposes around the world. It is derived from the plant cannabis sativa which has various other compounds known as cannabinoids. Most common form of cannabis used for recreational purpose is marijuana, which is prepared from dried flowering tops and leaves. The primary psychoactive component is delta 9-tetrahydrocannabinol (δ-9THC), which exerts its physiological and psychological effects through its interaction with CB1 and CB2 receptors. Smoking is the most commonly used method with onset of effects within minutes after inhalation. Oral ingestion of cannabis has varied absorption with delayed onset but longer duration of action. Urine …

Perceived Harms And Benefits Of Parental Cannabis Use, And Parents’ Reports Regarding Harm-Reduction Strategies, Kathleen J. Donoghue

Theses: Doctorates and Masters

This research focussed on families in which at least one parent was a long-term cannabis user; I explored family members’ perceptions of the benefits and harms of cannabis use and the strategies parents used to minimise cannabis-related harm to themselves and their children. In depth, semi-structured interviews were undertaken with 43 individuals from 13 families, producing a series of family case studies that enabled examination of multiple perspectives within each family. In Study 1, I used an interpretive framework guided by Miles and Huberman’s (1994) thematic content analysis technique to analyse interview data, while study 2 yielded detailed descriptive vignettes …

: A Neurobiological Model For Pathways Of Transition To Psychosis Due To Cannabis, Amresh Srivastava

Amresh Srivastava

Cannabis has been implicated as a risk factor for the development of schizophrenia, although the exact biological mechanisms remain unclear. Purpose of this presentation is to explore trajectory for psychosis due to cannabis based upon a neurobiological model. A selective Pubmed search was carried out to construct a model of pathway based upon our hypothesis. The hypothesis for this conceptual paradigm is that neurobiological changes exist and cannabis metabolites modulate these changes in a sequential manner from genetic expression, environmental and biological interaction and neurochemical dysfunctions leading to cognitive dysmatria. Dopamine remains a final common pathway which leads to core …

Cannabis And Psychosis: Transition To Psychosis, Amresh Srivastava, Kristen , Terpstra, Yves Bureau

Amresh Srivastava

Cannabis has been implicated as a risk factor for the development of schizophrenia, however, but the pathway of cannabis causing psychosis is not well understood. It appears that cannabis does not cause any structural changes per say but deficits in areas of the brain responsible for memory and emotion do show some changes. Recent studies suggest that cannabinoids such as CB1 have a pharmacological profile similar to that of atypical antipsychotic drugs. This mechanisms may involve dopamine, GABA, and glutamate neurotransmission; It is still not known if these changes are transitory or permanent, and whether or not they contribute to …

Cannabis Use In Cape York Indigenous Communities: High Prevalence, Mental Health Impacts And The Desire To Quit, India Bohanna, Alan R. Clough

Aboriginal Policy Research Consortium International (APRCi)

Anecdotal reports suggest that high rates of cannabis use and dependence are significant issues in Indigenous communities in north Queensland; however, there is little scientific evidence to support or refute this.The Cape York Cannabis Project seeks to investigate cannabis use rates, cannabis dependence and mental health impacts for the first time in three Cape York Indigenous communities.

Interface Of Cannabis And Early Psychosis--Priorities In Research And Service Development, Amresh Srivastava

Amresh Srivastava

Introduction: cannabis continues to affect mental health. Its abuse is on rise globally. In Canada a rise by 30% in last ten years has been observed in high school students. Interrelationship of cannabis with psychosis and schizophrenia is a complex one. Cannabis is highly comorbid with psychosis, & related to functional disability and outcome. It poses several challenges in understanding causal relationship for comorbidity, underlying neurochemical basis and specifics of service development. Prevalence of Cannabis varies from 20 to 50% early psychosis. Objective of this paper is to review available literature to identify challenges for newer targets of research and …

Interface Of Cannabis And Early Psychosis--Priorities In Research And Service Development, Amresh Srivastava

Psychiatry Presentations

Introduction: cannabis continues to affect mental health. Its abuse is on rise globally. In Canada a rise by 30% in last ten years has been observed in high school students. Interrelationship of cannabis with psychosis and schizophrenia is a complex one. Cannabis is highly comorbid with psychosis, & related to functional disability and outcome. It poses several challenges in understanding causal relationship for comorbidity, underlying neurochemical basis and specifics of service development. Prevalence of Cannabis varies from 20 to 50% early psychosis. Objective of this paper is to review available literature to identify challenges for newer targets of research and …

Outcome Evaluation Of The School Drug Education Project: Final Report Presented To The School Drug Education And Road Aware Project, Therese Shaw, Margaret Hall, Donna Cross, Hamilton Greg

Research outputs pre 2011

In 2002, Curtin University's Western Australian Centre for Health Promotion Research provided a report which explored the feasibility of a range of options to evaluate the impact of the School Drug Education Project (SDEP) on students' drug use, perceptions of drug-related harm and attitudes towards drug use. Given the difficulties of achieving a prospective design, this proposal recommended comparing retrospective measures of SDEP participation, level of SDEP training and dose of SDEP implementation with Years 8-12 student drug-related outcome data collected from four large Western Australian studies conducted somewhat concurrently with the School Drug Education Project.

It was hypothesised that …

Trans-Adaption Of Successful Cigarette Smoking Intervention To Randomised School-Based Cannabis Intervention Trial, Child Health Promotion Unit, Edith Cowan University

Research outputs pre 2011

Despite the emergence of cannabis use as a public health issue of significance in the 21st Century, no school-based interventions specifically addressing cannabis use have been reported in the literature. The prevalence of adolescent cannabis use has risen during the 1990s while the age of onset has decreased. This three-year trial seeks to trans-adapt a successful school-based cigarette smoking program underpinned by harm minimisation (HM) theory (including abstinence messages), into a school-based cannabis intervention trial. This innovative intervention will be compared to the largely abstinence-based drug use prevention activities currently used in W A. The first and second years of …