Inclusion Criteria:  HIV-positive (confirmed via HIV medication or relevant HIV labs in subject's name) Self-report of cannabis use at least once per week in the 6-month period prior to consent Provide a positive urine toxicology (UTOX) screen for cannabis Not seeking treatment for cannabis use Willing to stop using cannabis for 28 days and attend eight study visits over six weeks. Ability and willingness to provide inform consent English fluency  Exclusion Criteria:  Currently receiving treatment for cannabis or other drug use disorder Diagnosed or receiving treatment for a current major depressive or anxiety disorder Diagnosed with any current alcohol or substance use disorder (excluding nicotine) using the Structured Clinical Interview for Clinical Disorders (SCID) Interview (22) Positive UTOX screen for opioids Having a medical, psychiatric, occupational, or other condition that, in the judgment of the study physician, would make participation difficult or unsafe.