"celebrities who went wrong"
Child Stars and Drugs
Weirdly, plenty of child stars become drug and alcohol addicts as they grow up.
Take, Britney Spears, Paris Hilton, Christina Aguilera, or Macaualy Culkin. Britney didn't do drugs, but she did have a weird break down. Paris, has admittedly, always been weird, and Christina Aguilera is weird anyway.