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Mean distances between cough medicine and other drugs.
| Pair | Mean distance |
|---|---|
| Cough medicine and heroin | .72 |
| Cough medicine and organic solvent | .84 |
| Cough medicine and marijuana | .68 |
| Cough medicine and tranquilizers | .76 |
| Cough medicine and “ice” | .71 |
| Cough medicine and ecstasy | .73 |
| Cough medicine and cocaine | .75 |
| Cough medicine and depressants | .81 |
| Cough medicine and ketamine | .67 |
