White lines on a mirror.A needle and spoon.For many users, the sight of a drug or its associated paraphernalia can elicit shudders of anticipatory pleasure.

• 对许多吸毒者而言，光是看到毒品或其相关用具，像是镜面上的白线，或是注射针头与汤匙，就会因预期快感而兴奋到发抖。