For Graham Samson the worst consequence of taking marijuana, cocaine and speed is that it leads to alcoholism. A bust for dealing and a night in jail scare him off the other drugs, but his mother is so bitchy, his girlfriend so fickle and the hassles of probation so frustrating that he takes to swigging his parents' scotch. Hitchhiking to nowhere one midnight Graham barely escapes death with a suicidal drunk who crashes on the bridge, and that shock along with the support of Janey, a nicer girl who cares, almost sets him straight. . . but of course the word on this latest drug of concern is that you can't stop, and in the end Graham's future looks as sour as the cheap wine and booze he's reduced to scrounging. Trivets seems better acquainted with the teenage drug scene than are some who presume to write about it, and there is always an audience, but as fiction I Can Stop. . . ranks back with the lurid psychedelic scares of the late '60's.