21585
CONCLUSIONS : Acute nicotine intake per se from smoking after abstinence enhances the reinforcing value of rewards unassociated with smoking , perhaps in a manner comparable to ad lib smoking after no abstinence .
 Chemical: nicotine
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: nicotine