12840
In the present study , 18 priority WHO smoke constituent yields ( nicotine - normalized ) were determined ( using two smoking regimens ) from 262 commercial brands including American , Virginia and local blends from 13 countries .
 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