15301
The authors review the existing evidence of the effect of nicotine on ' bone ' and ' bone cells ' and fracture repair , drawing conclusions relevant to clinical practice and future research .
 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