2560
METHODS : A sample of 997 participants ( 52 % male ) was recruited to four control groups ( non - drug ( ND ) , alcohol / nicotine ( AN ) , cannabis / alcohol / nicotine ( CAN ) , non - ecstasy polydrug ( PD ) ) , and two ecstasy polydrug groups ( present ( MDMA ) and past users ( EX - MDMA ) .
 Chemical: alcohol; Chemical: nicotine; Chemical: AN; Chemical: cannabis; Chemical: alcohol; Chemical: nicotine; Chemical: CAN; Chemical: ecstasy; Chemical: ecstasy; Chemical: MDMA; Chemical: MDMA
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: alcohol; Chemical: nicotine; Chemical: AN; Chemical: cannabis; Chemical: alcohol; Chemical: nicotine; Chemical: CAN; Chemical: ecstasy; Chemical: ecstasy; Chemical: MDMA; Chemical: MDMA