| Rank | Board name and description | Posts | Members |
| 1 | Shroomery Psychoactive mushroom cultivation forum | 6559810 | 50075 |
| 2 | Overgrow Forums - discontinued Marijuana growing discussion | 6016336 | 133844 |
| 3 | Grass City Marijuana Growing and Smoking community | 2356646 | 94870 |
| 4 | Drogen Forum Drugs forum (in german) | 1731136 | 4165 |
| 5 | Behigh.org Russian psychedelic forum | 1119274 | 8447 |
| 6 | Garden's Cure Marijuana growing forums | 990129 | 29748 |
| 7 | Yahooka - discontinued Marijuana growers & user community | 865039 | 7324 |
| 8 | Cannabis World Marijuana cultivation discussion forums | 807527 | 22812 |
| 9 | ePharmacyWatch Forum about buying prescription drugs online and telemedicine | 678293 | 117902 |
| 10 | Mauisun Anti narcotics discussion board | 657397 | 35351 |