“…The remaining 10 items (irritable, anxious, difficulty concentrating, restless, impatient, hunger, somatic symptoms, increased eating, drowsy, headaches) were averaged, yielding a total withdrawal score. The individual craving item and the total score have high reliability and good construct validity (Hughes & Hatsukami, 1986;West, Ussher, Evans, & Rashid, 2006). (Watson, Clark, & Tellegen, 1988) consists of two 10-item scales that measure aspects of positive affect (PA: active, alert, attentive, determined, enthusiastic, excited, inspired, interested, proud, strong) and negative affect (NA: afraid, ashamed, distressed, guilty, hostile, irritable, jittery, nervous, scared, upset).…”