"...Nick now claims that he was searching for methamphetamine for his entire life, and when he tried it for the first time, as he says, ''That was that.'' It would have been no easier to see him strung out on heroin or cocaine, but as every parent of a methamphetamine addict comes to learn, this drug has a unique, horrific quality. In an interview, Stephan Jenkins, the singer in the band Third Eye Blind, said that methamphetamine makes you feel ''bright and shiny.'' It also makes you paranoid, incoherent and both destructive and pathetically and relentlessly self-destructive. Then you will...