23535
This selective effect was observed at plasma levels of nicotine that were within the range reported for smokers ( 10 - 50 ng ml ( - 1 ) ) .
 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