· A 3-hour screening evaluation to determine eligibility.
· A 1.5 hr visit to get trained on study tasks.
· If you are eligible, 7 study session where you use alcohol and cannabis, either alone or both at the same time. Each session lasts about 8 hours in the lab and are spaced at least 48 hours apart. You can do up to 2 sessions per week.
· Please note that the 2 screening visits and 7 study sessions must take place during weekdays and will occur at the Johns Hopkins Bayview Medical Center in Baltimore, Maryland

All calls and participation related to this study are confidential: This survey will be collecting information about you. Your taking part in this survey is completely voluntary. Whether you join the study or not, the information collected today may be seen by researchers at Johns Hopkins, any sponsor of the study, and those responsible for oversight of the study. We try to make sure that the information we collect from you is kept private and used only for the research study we are discussing. The information we collect from you is kept confidential and used only for the research study we are discussing. If you do not agree to continue this survey, it will not affect your current or future care at Johns Hopkins. Your personal information will be kept if you choose not to enroll in the study or if you do not qualify to be in the study. This will be done so that we do not contact the same people twice.