| Brown University Research Study | 4 | researchchemicals | | | | |
| Brown University Research Study NSFW | 3 | askdrugs | | | | |
| Brown University Research Study | 3 | OpiatesRecovery | | | | |
| Brown University Research Study | 2 | FentanylRecovery | | | | |
| Brown University Research Study | 1 | harmreduction | | | | |
| Brown University Research Study NSFW | 1 | Drugs | | | | |
| Brown University Research Study | 1 | shroomers | | | | |
| Brown University Research Study NSFW | 1 | cocaine | | | | |
| Brown University Research Study | 1 | AddictionAdvice | | | | |
| Brown University Research Study | 1 | dryalcoholics | | | | |
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