24244
The designs included tobacco substitute sheet ( TSS ) containing glycerol , which dilutes toxicants in smoke , or the incorporation of blend - treated ( BT ) tobacco to reduce the levels of nitrogenous toxicant precursors and some polyphenols .
 glycerol, polyphenols
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 glycerol, polyphenols