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In this study , we measured pH , moisture , nicotine ( total and unprotonated ) , and tobacco - specific N - nitrosamines ( TSNAs ) for other established ( twist , loose leaf , plug , and dry snuff without pouch ) and emerging oral tobacco products ( dry snuff pouch , US - made snus , and dissolvable tobacco ) .
 Chemical: nicotine; Chemical: N - nitrosamines
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: N - nitrosamines