Earlier this month on The Tonight Show, Miley Cyrus told host Jimmy Fallon that she’d quit using marijuana because she had a dream “that I would die during my monologue on SNL for some reason, just get so stoned that I just died.”
The singer quickly added that she knows people don’t typically die from smoking weed. But she also had realistic concerns about her habit, too: She’d been spending too much time sitting at home eating and playing with her pets, Cyrus joked, “and not enough time actually doing really anything.” And while working on her new album, she wanted to make sure her mind was “super clear.”
Cyrus brings up good points about potential negative side effects of the drug. Yet—as medical and recreational marijuana use are becoming increasingly legal across the United States (and illegal use is on the rise too)—studies have shown pot can have benefits for health and well-being, as well.
So what, exactly, are the pros and cons of pot? Health looked at recent research and spoke with several experts about who might want to try it, who should avoid it, and what any marijuana user should know.

It may help with anxiety and PTSD

The relaxing effects of marijuana are well known, so it’s not surprising that a 2016 paper in the journal Clinical Psychology Review concluded that it may have benefits for people with depression, social anxiety, and post-traumatic stress disorder. A recent study published in Drug and Alcohol Dependence also found that a very low dose of THC, one of the main compounds in marijuana, helped people feel less nervous about a public-speaking task.
But it may not be that simple: That dose was equivalent to only a few puffs on a marijuana cigarette, say the study authors. They also found that slightly higher amounts of TCH—anything that would produce even a mild high—actually made anxiety worse. Other research has also suggested that marijuana may be more harmful than helpful for people with certain mental health conditions, like psychosis or bipolar disorder.
The research “indicates cannabinoids could be helpful for people with anxiety,” lead author Emma Childs, PhD, associate professor of psychiatry at the University of Illinois at Chicago, tells Health. 

But more research is needed, she says, to determine appropriate dosages and delivery methods, and to prevent the opposite effects from happening.