yes in 2007 but then she stopped
Demi has said in an interview that she would not be telling the truth if she said she's never done them. There have been reports of her doing cocaine.
NO!
5.3 and a half
Probbaly when she was 7 or 8 years old because Demi Lavato met Selena Gomez in a place where u audition like britans got tallent and they both passed so under 7 or over. But i know not over 10 years...