Stephen Lankenau has spent years studying how people use cannabis in everyday life. As director of Drexel University’s Medical Cannabis Research Center, he has watched legalization spread, products grow stronger and daily use become increasingly common.

Young people who use cannabis daily are up to four times more likely to develop psychosis than those who don't, according to an international study led by University of Queensland researchers. The review analyzed evidence from 17 previous studies to assess whether cannabis use played a contributory role in the development of mental health disorders,

For millions of people, cannabis has become the unofficial prescription for lost sleep. But what feels like a solution may be quietly making the problem worse. Consider these two cases: She is 15 and has been lying in bed for the past hour.

More women are turning to marijuana to treat pregnancy-related illnesses, but experts warn of possible adverse side effects. Cannabis use is rising among pregnant women — especially during the first trimester, the most critical period of fetal ...

Marijuana/nicotine co-use are a worsening problem in teens and young adults. This group perceives tobacco as bad but don't realize nicotine + cannabis, is also a problem.