17054
We previously reported that regular recreational intranasal cocaine users exhibit impaired recognition of facial expressions of fear compared to occasional cocaine users and cocaine - na i ve controls .
 Chemical: cocaine; Chemical: cocaine; Chemical: cocaine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: cocaine; Chemical: cocaine; Chemical: cocaine