1356
Safety profile of a nicotine lozenge compared with that of nicotine gum in adult smokers with underlying medical conditions : a 12 - week , randomized , open - label study .
 nicotine, nicotine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 nicotine, nicotine