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An 18-year-old man with attention-deficit-hyperactivity disorder (ADHD) was prescribed varenicline for smoking cessation.
 ( potential therapeutic event: prescribed ,  An 18-year-old man with attention-deficit-hyperactivity disorder (ADHD): Subject, 18-year-old: Subject.Age, man: Subject.Gender, attention-deficit-hyperactivity disorder (ADHD): Subject.Disorder, varenicline: Treatment, varenicline: Treatment.Drug, smoking cessation: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( potential therapeutic event: prescribed ,  An 18-year-old man with attention-deficit-hyperactivity disorder (ADHD): Subject, 18-year-old: Subject.Age, man: Subject.Gender, attention-deficit-hyperactivity disorder (ADHD): Subject.Disorder, varenicline: Treatment, varenicline: Treatment.Drug, smoking cessation: Treatment.Disorder) 