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| Condition | Study Title | Investigator |
|---|---|---|
| Marijuana | Influence of Quitting Tobacco Cigarettes on Cannabis Effects | Margaret Haney, PhD |
| Marijuana | Study of Brain Activity and Decision-Making in Marijuana Smokers | Suzette Evans, PhD |
| Opioids | Does Marijuana Reduce Opioid Withdrawal? | Jermaine Jones, PhD |