Some common behavior changes you may notice if someone you know is abusing drugs and alcohol are:

  • Sudden or extreme change in friends, eating habits, sleeping patterns, physical appearance, coordination or school performance.
  • Loss of interest in hobbies or family activities.
  • Hostile or uncooperative attitude.
  • Secrecy about actions or possessions.
  • Stealing money or an unexplained need for money.
  • Medicine containers, despite a lack of illness, or drug paraphernalia in the individual’s room.
  • An unusual chemical or medicine smell on the individual or in the individual’s room.

Provided by the Mayo Clinic website