Answer:
The best way a teen can save another teen is to prevent them from ruining their life. Many teens change friends when they decide to begin using drugs, drinking alcohol and skipping school. This means they leave another group of teen friends behind. These are their good or positive friends. The good friends can definitely have an impact on the teen that is moving in a negative direction. Some teens may believe that by talking to their friends parents they are ratting their friend out. In reality they may be saving their former best friends life. Some parents have found it necessary to send their teen to a teen boot camp to save them from going to prison or being killed. This isn't an exaggeration. Parent's don't realize how much trouble their teen is really in, until they are safely enrolled in a secure environment and begin to open up to them.
In summary the best way for a teen to help a teen is to look at the big picture and refuse to let a friend ruin their life.
Dave
http://www.bootcampsforteens.com/