Although different types of drug addiction have different physical effects but symptoms of addiction are almost similar. Common sign & symptoms of drugs addiction are:

1. Changes in appetite or sleep patterns
2. Sudden weight loss or weight gain
3. Unusual smells on breath, body, or clothing
4. Drop in attendance and performance at school or work
5. Unexplained need for money or financial problems
6. Engaging in secretive or suspicious behaviours
7. Frequently getting into trouble (fights, accidents, illegal activities)
8. Unexplained change in personality or attitude
9. Sudden mood swings, irritability or angry outbursts