25323
RESULTS : Analyses indicated that both nicotine infusions acutely enhanced PPI among non - smokers , and this enhancement was positively related to the degree of smoking among first and second - degree relatives .
 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