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Combination NRT likely represents the most promising strategy moving forward ; other clinical strategies offer conflicting evidence but deserve further testing ( pre - quit NRT or tailored treatment ) or offer potential utility but are in need of further , direct tests .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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