A study of 2000 Australian 24-year-olds found that those who had used marijuana as teenagers were more likely to use amphetamines as young adults.

The authors found that such early drug use was a more accurate predictor of using more dangerous substances later than other factors such as socio-economic background or mental depression.

This article appears in the journal Addiction.

Teenage drug addiction is often a symptom rather than the problem with troubled teens. Visit 4TroubledTeens.com to learn more.

Labels: marijuana, meth, prevention