While the number of college-age young adults drinking has fallen, the number using marijuana, or both marijuana and alcohol, is up, researchers say.

New research finds a link between using marijuana during pregnancy and the risk of psychotic-like experiences, depression, and social problems for kids.

A study in Washington state suggests legalization of marijuana has slowed a reduction in teen use. They may perceive it as less harmful.

As disruptions to daily life worsen during the pandemic, more adults report using alcohol and marijuana to cope with stress.

Women who experience stressful life events in the year before childbirth are more likely to use marijuana before and during pregnancy.

"...marijuana use by fathers, not just mothers, can have an impact on the health of offspring even when use occurs before conception."

A new handheld spectrometer can quickly determine whether plants are hemp or marijuana. It's a subtle distinction with legal consequences.

"People are using cannabis and cannabinoids for everything and anything, and we don't have enough systematic research on whether it's effective..."

"Using marijuana in adolescence is associated with...problems in the present and later into adulthood. Now we see that echoing through to their children."

With the recent spate of deaths and severe injuries linked to vaping, an expert weighs in on what she calls a "terrifying" crisis.