Teenagers' parents can make a difference in whether their kids drink, smoke or use marijuana, based on past research. But the parents of teens' friends play a part too.

After Lance Armstrong gave up his case against the US Anti-Doping Agency, the organization and similar ones around the world now have new, more effective tools to find blood dopers.

A study on how ecstasy during pregnancy might affect babies at 4 months old was published early this year. Now those babies are a year old. They're still developing slowly.

Most people have known that smoking marijuana was not safe for pregnancy. Modern, high-potency marijuana poses additional dangers for fetal development.

One of the more difficult forms of drug abuse to control among teens is prescription drug abuse. Prescription drugs, like stimulants prescribed for attention deficit hyperactivity disorder, can be abused for recreational purposes. 

Who would have thought a text message could put a teen on a sex offender list? Yet this is one of the more extreme possible consequences of the increasing trend of " sexting ."

Steroid abuse is always bad, but for teens the damage can be more serious and last longer. Steroids can change the way an adolescent’s brain develops and vital organs function.

The summer months are a time for rest and relaxation. For some teens though, they can also be a time for risk taking and substance abuse.

Kids that live in homes where their parents use methamphetamines are often abused and neglected. Foster care interventions can help place the child in a better environment.

More boys are diagnosed with attention deficit hyperactivity disorder (ADHD) than girls. But more of these girls are vulnerable to having other problems later in life.