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Most frequent substances used *.
| Substance | N | Substance | N |
|---|---|---|---|
| San Francisco | Chicago | ||
| Cannabis | 12 | Cannabis | 15 |
| Cocaine | 2 | ||
| Narcotics (heroin, methadone) | 2 | ||
| Stimulants (methamphetamine, amphetamine) | 2 | ||
| Cough medication | 1 | ||
* Among M.I.N.I. Substance Abuse/Dependence; Non-Alcohol.
