Stanford experts highlight cannabis risks for seniors as potency rises

The Surge in Senior Cannabis Use

Seniors are using more cannabis now, with 7% of people over 65 reporting recent use in 2023—a jump of 46% since 2021, per the National Survey on Drug Use and Health (NSDUH). This trend matches broader legalization efforts in 40 states for medical use and 24 for recreational access. But modern cannabis has much higher potency, with average THC levels hitting 20% compared to 1-4% in the 1970s. This shift raises concerns for older adults, especially as synthetic cannabinoids and concentrated forms become more common. The NSDUH data also shows that 65% of seniors using cannabis do so for chronic pain, sleep issues, or anxiety—conditions often managed with multiple medications.

Rising Risks of High-Potency Cannabis Use

“We’re trying to catch up in understanding how that drastic increase in psychoactive ingredients affects the brain and body.”

A major finding is the sharp increase in cannabis-related emergencies among seniors. A Canadian study found poisoning cases among older adults nearly tripled after nationwide legalization, with THC edibles containing 90% potency tied to serious problems like heart palpitations, memory issues, and cardiac arrest. Dr. Claudia Padula says, “We’re trying to catch up in understanding how that drastic increase in psychoactive ingredients affects the brain and body.” This matches a 2023 Journal of Emergency Nursing study showing 31% of regular users aged 65-79 had trouble driving within hours of use, highlighting the need for tighter rules on high-potency products. The NSDUH data also shows seniors are more likely to self-medicate without checking with doctors, raising the chance of harmful drug interactions.

Cardiovascular Risks and Medication Interactions

Regular cannabis use is linked to a 29% higher chance of heart attacks and a 20% increased stroke risk, according to Stanford Cardiovascular Institute studies. These findings are especially worrying because heart disease is still the top cause of death in the U.S. Dr. Joseph Wu notes that smoking cannabis causes blood vessel inflammation, adding risks for seniors already on medications like blood thinners. CBD can mess with enzyme systems that break down drugs, possibly leading to dangerous bleeding. A 2025 Drugs & Aging review found 2.9% of seniors aged 65+ used cannabis, with 37% reporting interactions with at least one prescription, including blood thinners and blood pressure meds. This matches a 2021 Harvard Review of Psychiatry analysis showing 15% of recreational users aged 65+ reported dependency symptoms, with 40% experiencing withdrawal when they stopped.

The Addictive Potential of Cannabis

Despite common assumptions, cannabis can be addictive, with 30% of regular users developing use disorder. Dr. Smita Das points out older adults often underreport use, complicating efforts to track addiction rates. Functional MRI studies by Padula show relapse triggers heightened sensitivity to environmental cues, suggesting similarities to other substance use disorders. While addiction rates are lower than for alcohol, mixing cannabis with tobacco or alcohol raises cardiovascular risks. A 2023 Cannabinoid Research study found 65% of seniors using cannabis for chronic pain reported using less medication, but 30% saw worse cognitive function over six months. This challenges the idea that cannabis is a safe alternative to opioids, showing its complex impact on aging brains.

Medical Benefits and Controversies

“Your primary care physician knows your medical history and medications, making them the best resource for evaluating risks.”

Studies on cannabis’s medical benefits are mixed. While FDA-approved CBD treats specific seizure disorders, its effectiveness for chronic pain or anxiety lacks strong evidence. Dr. Eloise Theisen notes that palliative care patients often use cannabis to reduce opioid dependence, though this needs careful monitoring. The American Psychiatric Association opposes cannabis as a psychiatric treatment due to insufficient evidence, despite its popularity for insomnia and anxiety. A 2023 Cannabinoid Research study found 65% of seniors using cannabis for chronic pain reported using less medication, but 30% saw worse cognitive function over six months. This highlights the tension between patient choice and medical oversight as cannabis access expands.

The Need for Medical Guidance

Experts stress older adults should talk to doctors before using cannabis. Dr. Das says, “Your primary care physician knows your medical history and medications, making them the best resource for evaluating risks.” This advice aligns with past examples, like the opioid crisis, where patient education and provider oversight helped reduce harm. As cannabis legalization grows, creating clear guidelines for senior use will be key to balancing potential benefits with known risks. A 2025 JAMA Internal Medicine study found seniors who discussed cannabis use with providers were 50% less likely to have bad outcomes compared to those who self-medicated. This shows the importance of including cannabis education in geriatric care models.