The purpose of this study is to learn more about how cannabis use affects memory, thinking, and stress response in older adults, and how ovarian hormones affect them in older women. Participants will undergo a screening process over telehealth to confirm eligibility. There is a second telehealth visit to complete questionnaires, a cognitive testing battery, and a medical history. There is one visit in the clinic where participants will provide urine and saliva samples for drug and alcohol testing and a blood sample for a lipid testing, and complete additional cognitive tasks. They will then complete CREMA sessions (Cue Reactivity Ecologic Momentary Assessment) at home, two times a day for ten days. CREMA sessions include answering questions about marijuana use and sleep, and rating stress and craving.

This study is enrolling emerging adults (ages 18-25) with cannabis use disorder (CUD) to examine sex differences in (a) cannabis withdrawal symptoms during short-term cannabis abstinence, (b) cannabidiol (CBD) versus placebo effects on stress reactivity during short-term cannabis abstinence, and (c) the relationship between stress reactivity and time to cannabis relapse after short-term cannabis abstinence. The proposed study is designed to reveal sex differences and guide the development of tailored treatments that address factors disproportionately affecting emerging adult females with CUD.

Participants will complete an assessment visit to determine eligibility. Eligible participants will be scheduled for their next visit and will be instructed to abstain from cannabis use for 3 days. Participants will be set up with a phone application (app) and given instructions on its use. This app will send twice daily, random surveys everyday throughout study participation with questions about cannabis use, cravings, and overall mood. Participants will also complete twice daily saliva samples.

At the end of the 3 days, participants will return to the clinic for their second visit. Participants will complete a urine and blood sample at each visit. After eating a snack, participants will receive one dose of CBD (800mg) or placebo and then participate in a stress task. Upon completion of the stress task, participants will complete 3 saliva samples and then be discharged after evaluation by research staff. After the completion of Visit 2, participants will continue to complete twice daily surveys for 10 days. The study will last approximately 14 days.

There are risks involved with participating in this study, including risks associated with CBD, risks associated with the stress task and study procedures, emotional distress from answering personal questions, and loss of confidentiality. There is a risk of experiencing cannabis withdrawal symptoms during the 3-day period of cannabis abstinence. Some potential risks related to CBD include dry mouth, diarrhea, reduced appetite, drowsiness, and fatigue. There is a risk of loss of confidentiality, but the researchers will code the samples and research information to protect privacy. There are no direct benefits to the participant, but we hope the knowledge gained will help us inform future clinical strategies to address cannabis use in emerging adults.

Cannabis is the most commonly used illicit substance among pregnant and postpartum women, with the postpartum period being a common time for relapse to cannabis. Currently there are no interventions for preventing return to cannabis use during this vulnerable time. The goal of this research is to better understand risk factors such as stress, craving, anxiety, mood, sleep, and hormone levels that may contribute to return to cannabis use during the postpartum period in order to help develop targeted prevention and treatment interventions in the future.

This study will examine how marijuana use can affect oral bacteria and brain health in people with HIV and without HIV. Early studies show that marijuana users have more oral bacteria than non-marijuana users. The increase in bacteria is believed to affect brain health. Participation in the study will be one visit. The visit will take approximately 120 minutes.

The purpose of the study is to compare a text message based mental health and substance use screening and referral to treatment program, called Listening to Women and Pregnant and Postpartum People (LTWP), to standard of care in-person mental health and substance use screening to look at rates of treatment attendance and retention in treatment. Participation would involve completing online surveys. You may be eligible to participate if you are age 18-45 years, are pregnant and entering prenatal care in one of MUSC's OB clinics, and attended a prenatal appointment at an MUSC clinic.

The purpose of the study is to compare a text message based mental health and substance use screening and referral to treatment program, called Listening to Women and Pregnant and Postpartum People (LTWP), to standard of care in-person mental health and substance use screening to look at rates of treatment attendance and retention in treatment. Participation would involve completing online surveys. You may be eligible to participate if you are age 18-45 years, are pregnant and entering prenatal care in one of MUSC's OB clinics, and attended a prenatal appointment at an MUSC clinic.

The purpose of the study is to compare a text message based mental health and substance use screening and referral to treatment program, called Listening to Women and Pregnant and Postpartum People (LTWP), to standard of care in-person mental health and substance use screening to look at rates of treatment attendance and retention in treatment. Participation would involve completing online surveys. You may be eligible to participate if you are age 18-45 years, are pregnant and entering prenatal care in one of MUSC's OB clinics, and attended a prenatal appointment at an MUSC clinic.

The purpose of this two-visit brain imaging (magnetic resonance imaging, MRI) study is to identify brain targets for improving treatment and preventative interventions for individuals at risk for co-occurring bipolar disorder and alcohol use disorder. The preliminary visit for a parent and his/her biological child will include completion of clinical interviews, surveys, and labwork to determine study eligibility. If they are considered eligible for the study, brain imaging visits will occur within 1-2 weeks at which a 1-hour MRI will be completed along with additional clinical interviews, surveys, and labwork. Brief follow-up phone call interviews will be completed with participants every 3 months for 1 year. Study participation is confidential and compensated.

This research study evaluates the effects of anFDA-approved medication Gabapentin in individuals with Bipolar Disorder who smoke marijuana. Participants in the study will will be assigned to take either Gabapentin or a matched placebo. Study medication will be taken for 17 days. There will be 5 study visits, with 2 MRI brain imaging scans completed. Questionnaires and clinical interview measures will be completed at study visits along with consistent assessment of potential side effects from study medication.

The study will test a computerized treatment with subjects ages 13-17 years who are interested in seeking treatment for alcohol and/or cannabis use. Follow-up assessments will be conducted at one- and three-months following treatment.