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Frequency of user reports. Themes are based on the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition criteria for substance use disorder.
| Themes | Reports of presence, n | Reports of absence, n |
| Unsuccessful attempts to reduce | 731 | 31 |
| Expenditure of time | 296 | 0 |
| Health problems | 91 | 169 |
| Craving | 29 | 93 |
| Withdrawal | 18 | 31 |
| Social problems related to use | 11 | 22 |
| Tolerance | 7 | 1 |
| Loss of control | 3 | 1 |
| Restriction of social activities | 1 | 0 |
| Neglecting responsibilities | 0 | 0 |
| Hazardous use | 0 | 0 |
