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Community - based studies suggest that cannabis products that are high in Delta 9 - tetrahydrocannabinol ( THC ) but low in cannabidiol ( CBD ) are particularly hazardous for mental health .
 Delta 9 - tetrahydrocannabinol, THC, cannabidiol, CBD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Delta 9 - tetrahydrocannabinol, THC, cannabidiol, CBD