This project aims to identify and evaluate internal barriers that inhibit engagement with pharmacological treatment for opioid use disorder (OUD). Participants, consisting of adults diagnosed with OUD, will complete a series of surveys that will take approximately 30 minutes. In conducting this study, investigators intend to identify barriers that could be improved by future interventions.

This study will examine sex differences in how the brain processes reward in people that regularly use cannabis. Men and women that use cannabis at least 4 days a week will participate in a study involving 3 in-person visits. The first visit will be used to determine eligibility for the study. The other two visits will last 7 hours each and take place at least two days apart. Visits include administration of either THC, the chemical responsible for many of the psychoactive effects of cannabis, or a placebo; completion of questionnaires; and a 1.5-hour brain scan.

The goal of the current project is to gather preliminary data from adults across the United States using an online survey study regarding alternative cannabinoid use, motivations, and experiences. We will also conduct interviews with some participants to gather more open-ended responses regarding the targets of interest in order to inform future work about alternative cannabinoids.

This is a small, test study to see if mailing buprenorphine works for patients with opioid use disorder and a recent medical hospitalization. It tries to remove some of the existing barriers to make it easier to stay in treatment and make it easier for individuals to keep taking their medicine after discharge. The purpose of this research study is to determine if mailing buprenorphine is possible, acceptable, and look at the early results of how well it works.

Adults (ages 18+) who use cannabis and are interested in reducing their use will be enrolled in an 8-week treatment program. All participants will receive counseling (1 goals session with a therapist followed by 7 weekly computerized cognitive-behavioral therapy sessions). Detailed cannabis assessments (biological and self-report) will be conducted throughout treatment and at 1- and 4-months post-treatment completion. Daily electronic diaries will be administered via text message to record detailed logs of cannabis use quantity and frequency. Participants are also asked at different points throughout the study to wear a Fitbit to monitor their sleep.

This study will examine genetic factors that contribute to the different ways people feel after consuming cannabis. People that use cannabis at least 4 days per week will participate in a study involving 1 in-person visit followed by a 5-day remote assessment period. The in-person visit will determine if an individual is eligible for study participation and their blood will be drawn to assess genetics. During the remote assessment period, participants will complete multiple short surveys per day describing their feelings and their recent cannabis use.

The primary objective of this proposal is to conduct surveys and qualitative interviews to get feedback from (1) stakeholders and (2) people with lived experience of opioid use and a related medical hospitalization, on the barriers and facilitators of new potential strategy of treatment. The potential proposed intervention we will ask questions about is the direct mailing medications for opioid use disorder (OUD) in an attempt to overcome many of the barriers that interfere with treatment retention (i.e. transportation). Qualitative interviews will be used to get feedback on the feasibility, appropriateness, and acceptability of mailing maintenance medications for OUD after a hospital discharge. In a future study, this feedback will be used to develop a protocol to test this method.

This is a smoking cessation study which is examining varenicline for use in reducing or quitting e-cigarettes. Half of the participants will receive a placebo pill and half will receive varenicline. All participants will be asked to complete daily, brief REDCap EMA diaries (to report e-cigarette use, other tobacco use, and record videos of medication taking) and attend research visits every 3 weeks (i.e., weeks 3, 6, 9, 12) to complete additional assessments and receive compensation for doing so.

This is a smoking cessation study which is examining varenicline for use in reducing or quitting e-cigarettes. Half of the participants will receive a placebo pill and half will receive varenicline. All participants will be asked to complete daily, brief REDCap EMA diaries (to report e-cigarette use, other tobacco use, and record videos of medication taking) and attend research visits every 3 weeks (i.e., weeks 3, 6, 9, 12) to complete additional assessments and receive compensation for doing so.

This is a smoking cessation study which is examining varenicline for use in reducing or quitting e-cigarettes. Half of the participants will receive a placebo pill and half will receive varenicline. All participants will be asked to complete daily, brief REDCap EMA diaries (to report e-cigarette use, other tobacco use, and record videos of medication taking) and attend research visits every 3 weeks (i.e., weeks 3, 6, 9, 12) to complete additional assessments and receive compensation for doing so.