A substance known as kratom is becoming increasingly common in smoke shops and convenience stores across California, prompting concern from some public health advocates about newer, more concentrated products derived

A growing number of Americans report they are unable to quit or cut down.

Carlos Dominguez started legally using cannabis at age 19. Four years later and with schizophrenia, he went on a stabbing spree in Davis.

Congress is trying to delay a law that would effectively kill the $28 billion intoxicating hemp industry.

A JAMA Health Forum study of 463,396 teens found cannabis use doubles the risk of psychosis and bipolar disorder. Cannabis typically preceded psychiatric diagnosis by 1.7–2.3 years.

A federal lawsuit accuses three big cannabis companies of lying about pot’s medical benefits and hiding its serious harms.

A new study published in the Journal of the American Medical Association associates adolescent cannabis use with increased risk for serious mental health conditions.

Researchers followed more than 400,000 teens until they were adults. It found that those who used marijuana were more likely to develop serious mental illness, as well as depression and anxiety.

Columnist Teri Sforza writes: In the few O.C. cities that allow cannabis businesses, the industry generates tax revenue — up to $10 million for youth and safety programs. But public health ty…

Current California rules on legal cannabis aren't tough enough, according to an Oakland-based research group.

Kentucky Republican hopes to win a two-year extension in spending legislation needed this month to head off a partial government shutdown.

Pot is quickly becoming America's drug of choice, on track to replace alcohol, but its harms are becoming clear as well.

Even occasional cannabis use is linked to worse school performance and emotional distress for teens, finds a new study led by Columbia University.

There’s no breathalyzer test for driving under the influence of cannabis. But there are other options.

Weirdly, Trump's executive order to reschedule cannabis coincides with an analysis casting doubt on whether pot actually helps with pain, insomnia and stress.

Kaiser Permanente survey suggests employees are more focused on tobacco risks than those posed by cannabis.

The review found that 27 percent of adults from the U.S. and Canada have used cannabis for medical purposes.

As daily cannabis use rises to historic levels in the U.S., some longtime users are finding it harder to quit.

Doctors say it's possible to get hooked on pot. There's a widespread misconception that marijuana is not addictive, and it's expanded as a growing number of states legalize pot.

Cannabis retailers and product manufacturers are moving away from potency and embracing products that offer "functional THC."

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New research from UC San Diego found that cannabis use among youth may be responsible for 13% of new cases of regular tobacco use in the US, suggesting that cannabis use should be considered a majo…