A new survey of US teens found that nearly 23 percent of 12th graders used marijuana over the last month, compared with 18.7 percent who said they smoked cigarettes.
Cell phone radiation has been proven to alter brain activity. But it's not clear if it's dangerous. Try an earphone?
Marijuana use among American teens is up, but binge drinking is down, says a federal 2010 survey on drug use among teenagers. For the first time, marijuana use has passed cigarette use in the survey.
Multitasking on smartphones, iPads, and the Mobile Web makes some feel smarter and others just more scattered. Is it changing how we think?
Adults are taking stimulants like Ritalin and Adderall, normally used to treat serious medical conditions, to boost their concentration and job performance. Critics ask: Is it making Americans too dependent on their medicine cabinets?
Teens can now get marijuana and prescription drugs more easily than last year. But drug usage is not up.