Loss of interest in things that, were once important!
Why? What has changed?

Drop in academic/work performance!
Check with teachers and/or employers

Loss of motivation/always tired!
Do activities warrant the behavior, and or is there an underlying medical condition?

Frequently Finds ways to get away!
Where are they going and are they where they say they will be? Verify activities, check text messages, My Space accounts, and emails.

Money Issues!
Users will become very manipulative and use every excuse to get money.

Items missing from house!
Users will do anything to support their addiction, including stealing from family and or others.

Only the love and mercy of God got Seth out! May you rest in peace.