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People with attention deficit hyperactivity disorder (ADHD) are more likely to self-administer nicotine and report more pleasurable responses than people without the condition, according to a study by Duke Health researchers. [...] Duke researchers tested a nicotine nasal spray to determine the effects of the addictive chemical on non-smoking young adults. They recruited 136 people aged 18-25 years. About half (61) of the participants had a clinical diagnosis of ADHD, and the others (75) were free from any psychiatric condition.