2563
Strikingly , despite prolonged abstinence ( mean , 4 . 98 ; range , 4 - 9 years ) , past ecstasy users showed few signs of recovery .
 Chemical: ecstasy
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: ecstasy