24490
An indirect smoking approach avoidance task was performed , in which participants were required to respond to pictures of smoking and neutral cues by pulling ( approach ) or pushing ( avoid ) on a joystick , according to the content - irrelevant format of the picture ( landscape or portrait ) .
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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:
 None