Talking to children about the dangers of drug use is sometimes hard for parents who experimented with drugs during their own teenage years. These parents often don't know exactly what to say, or how honest they should be.
"Avoid giving your child more information than she or he asked for. No need to talk about keg stands and smoking pot 132 times. [However]...don't risk losing your credibility after the kids discover the real story from a chatty uncle at a family party."
Before talking to your teenager, think about the reasons why you regret using drugs when you were younger. Share those regrets during your talk, and give your child a chance to respond and ask questions.