In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: The epidemiologic findings are most consistent with the hypothesis that chronic cocaine use disrupts dopaminergic function and , when coupled with recent cocaine use , may precipitate agitation , delirium , aberrant thermoregulation , rhabdomyolysis , and sudden death .
### Output Text:
The epidemiologic findings are most consistent with the hypothesis that chronic <span class="chemical">cocaine</span> use disrupts dopaminergic function and , when coupled with recent <span class="chemical">cocaine</span> use , may precipitate agitation , delirium , aberrant thermoregulation , rhabdomyolysis , and sudden death . 