30589
CONCLUSION : Our results show that chronic nicotine consumption in smokers alters cortical excitability independent from acute nicotine consumption and that acute nicotine has different effects on motor cortical excitability in both groups .
 Chemical: nicotine; Chemical: nicotine; 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; Chemical: nicotine; Chemical: nicotine