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癮(addiction)即係心思思好想再做返嗰樣嘢,好似有人迫噉,再做返會開心,但係好難戒,如果夾硬戒就會悶或者唔舒服,就算戒咗做嗰樣,心癮都重喺度。精神學上係叫依賴症。例子有食煙、賭錢、打機、手淫、唱歌。有啲癮係有藥物成份,例如毒品同煙仔,就係令個腦有快感。
醫學上稱癮,係偏重於藥理之上。戒藥癮有啲會有好強烈嘅身體反應。
有多個犒賞系統(reward system)嘅腦區都俾人指同上癮有關係:
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