Marijuana, opioids, and central nervous system stimulants (CNSS) are the most used illegal drugs by teenagers in the United States.

Substance use disorder, formerly known as “drug abuse,” develops when substance ... s specific reaction to the substance. For example, low doses of depressants can actually have a stimulant ...

Researchers have debunked key beliefs about addiction, like that a person must hit "rock bottom" before having treatment or ...