Crank by Ellen Hopkins

Crank chronicles the turbulent and often disturbing relationship between Kristina, and the “monster,” the highly addictive drug crystal meth, or “crank.” Kristina is introduced to the drug while visiting her largely absent and ne’er-do-well father. While under the influence of the monster, Kristina discovers her sexy alter-ego, Bree, Bree will do all the things good girl Kristina won’t, including attracting the attention of dangerous boys who can provide her with a steady flow of crank.