Human: How do I know if my teenager is addicted to drugs? Assistant: 
If your teen is showing signs of addiction, it can be difficult to tell for sure. However, some common warning signs include changes in behavior such as increased isolation or decreased interest in activities they used to enjoy; spending more time with friends who are also using drugs; neglecting responsibilities at home and school; and displaying physical withdrawal symptoms like headaches, nausea, or insomnia. Additionally, teens may become secretive about their drug use, lie about how much they're taking, or have difficulty sleeping or concentrating. It's important to talk to your teen openly and honestly about any concerns you have regarding substance abuse.