Consumer Reports has no financial relationship with any advertisers on this site. Many U.S. states have legalized cannabis, and there has been a significant increase in the number of older adults using it, says Jeffrey Quinlan, a family physician and professor of family medicine at the University of Iowa Carver College of Medicine in Iowa City.

In fact, 21 percent of people ages 50 and up have smoked, vaped or consumed cannabis (in what’s usually called an edible) in the past year, according to a recent poll from the Institute for Healthcare Policy and Innovation at the University of Michigan. And 12 percent do so at least once a month. The reasons? To relax, improve sleep, feel good, relieve pain and improve mental health or mood.

But is this safe? “There’s not a lot of research,” Quinlan says. That said, we have at least some evidence that cannabis may help some people, but there are risks — for older adults in particular.

How cannabis might help

Some patients tell Quinlan they use cannabis to help with pain, anxiety and sleep — similar to the medical reasons mentioned in the Michigan poll. Of these, the evidence is strongest for treating chronic pain.

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There’s also substantial evidence that it may ease nausea and vomiting associated with chemotherapy and may help control muscle spasms from multiple sclerosis, according to a 2017 report from the National Academies of Sciences, Engineering and Medicine. And some evidence suggests that cannabis may provide some short-term help for people who have trouble sleeping due to obstructive sleep apnea, fibromyalgia, chronic pain and MS.

But we still have much to learn about the right dosages, which vary from person to person and can change over time, as well as the efficacy of cannabis compared with other treatments, says Erin Bonar, a professor of psychiatry at Michigan Medicine of the University of Michigan at Ann Arbor. She’s one of the researchers associated with the poll.

Risks of cannabis use

Some doctors say that cannabis is a safer way to manage chronic pain than powerful, potentially addictive opioid drugs. But about 21 percent of regular users develop cannabis use disorder. This can increase the likelihood of risky behaviors like driving while high, and it can affect relationships and increase tolerance for cannabis, which causes some people to use it more and more.

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And higher doses can elevate heart rate and increase blood pressure, Quinlan says, which may raise heart attack and stroke risks, especially in people who already have heart disease.

People who use cannabis for mental health problems like anxiety also need to be wary, Bonar says. In some cases, it might improve the condition short-term, she says. But some people then feel worse when not using it, which can escalate anxiety over time. And recent research suggests that it’s associated with a greater likelihood of mental health and substance abuse problems, as well as accidents and injuries. High dosages can also cause paranoia and in rare cases can increase the risk of psychosis.

Before using cannabis

Tell your doctor. According to the Michigan poll, 44 percent of monthly cannabis users said they had not discussed it with their health care providers. Your doc can tell you if medications you may be taking — such as blood thinners, statins, antihistamines, antidepressants and medications with sedative effects — interact with cannabis. Your doctor may also be able to give you guidance on how to access medical cannabis — though it won’t be covered by Medicare or other insurance because it’s still illegal on the federal level — and help you monitor your use to see whether it’s helping.

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Avoid smoking and vaping. Using cannabis in these forms may cause health problems just like smoking or vaping tobacco, Quinlan says.

Be wary of THC content labels. Most research indicates they’re not reliable. So if you’re going to use cannabis, opt for the lowest possible dosage (which may be an edible with 5 milligrams of THC or less), especially if you haven’t used the substance before, Quinlan says. Plus, it’s now easy to find cannabis products with a strength of 20 to 30 percent. The average potency in the 1990s was around 4 percent, Bonar says.

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