21380
Though long - term exposure to nicotine is highly addictive , one " beneficial " consequence of chronic tobacco use is a reduced risk for Parkinson ' s disease .
 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