US scientists have found a key mechanism in the brain that helps explain why cocaine is so addictive and could pave the way towards a potential cure, a study showed Thursday. Researchers revealed how the highly-addictive drug brings on changes in the brain through a process which influences the expression of genes without changing the brain's gene sequence. These ...

A decade-long decline in teens' use of pot has stalled and some teen attitudes on how harmful marijuana can be may be softening, according to a federal survey on teen drug use released Monday. The findings were based on a survey of roughly 47,000 ...

Smoking marijuana is becoming even more popular among U.S. teens and they have cut down on smoking cigarettes, binge drinking and using methamphetamine, according to a federal survey released Monday. More teens also are getting high on prescription pain pills and attention-deficit drugs, according to eighth ...