Two new Canadian studies are the largest to date looking at death rates and psychosis associated with cannabis use disorder.

Heavy weed use may be far more dangerous than people realize, according to a pair of studies published in JAMA Network Open.

People who need emergency care or hospitalization for cannabis use disorder are at an elevated risk of premature death within five years, a new Canadian study suggests.

A new study links heavy cannabis use to head and neck cancer. Learn about the risks, research findings, and prevention strategies.

The proportion of incident cases of schizophrenia associated with cannabis use disorder (CUD) almost tripled from the prelegalization to legalization of nonmedical cannabis periods, according to a study published online Feb.

Schizophrenia cases associated with problematic weed use have skyrocketed in the wake of Canada's legalization of marijuana, a new study says.