As cannabis use continues its upward trajectory across the United States, particularly among the senior population, experts at Stanford Medicine are issuing a critical warning: contemporary marijuana products are significantly more potent than many individuals realize, carrying a spectrum of serious health risks that demand careful consideration. This evolving landscape necessitates a deeper understanding of how these powerful substances interact with the aging body and mind.
The Shifting Landscape of Cannabis and Aging
Eloise Theisen, a geriatric nurse practitioner specializing in cannabis therapy at Stanford Medicine, found herself unexpectedly at the forefront of this medical frontier. Her personal journey with cannabis began after a severe car accident left her managing chronic pain that resisted conventional treatments. Returning to her work in an oncology clinic, she observed a growing trend: many patients were already using cannabis or contemplating its use, often without the guidance of healthcare professionals.
"I found that our patients were going to use it whether their providers approved of it or not," Theisen stated. "Many of our patients were older, and they had risks that needed to be evaluated and addressed before they started using cannabis." This observation highlighted a critical gap in patient care, particularly for a demographic often overlooked in discussions about substance use.
The increase in both medical and recreational cannabis consumption among adults over 65 is a documented phenomenon. According to the National Survey on Drug Use and Health, the percentage of adults aged 65 and older reporting recent cannabis use rose from less than 5% in 2021 to 7% in 2023, indicating a notable uptick in just two years. Despite this rise, significant questions persist regarding cannabis’s precise effects on the aging body and brain, a challenge compounded by its continued federal illegality, which can impede comprehensive research efforts.
Many older adults turn to cannabis with the hope of alleviating chronic pain, combating insomnia, or managing anxiety. However, Dr. Smita Das, a clinical associate professor of psychiatry and behavioral sciences at Stanford Medicine, emphasizes that a broad medical consensus on cannabis’s efficacy for these conditions remains elusive.
Potency Surge: A New Era of Cannabis
A primary concern voiced by Stanford Medicine specialists is the dramatic increase in the potency of cannabis products compared to those available decades ago. In the 1970s, the average tetrahydrocannabinol (THC) content, the primary psychoactive compound, ranged from a mere 1% to 4%. Today, legal cannabis flower typically boasts an average THC concentration of around 20%, with some strains reaching as high as 35%.
The concentration escalates further with other product types. Cannabis oils, edibles, and concentrates can contain THC levels approaching 90%. The potential dangers are amplified by synthetic marijuana products, such as Spice or K2, which are significantly more potent and have been linked to severe cardiac events. These synthetic products are illegal in California and numerous other states.
"We’re trying to catch up in our understanding of how that drastic of an increase in the psychoactive ingredient is impacting the brain and the body," explained Dr. Claudia Padula, an assistant professor of psychiatry and behavioral sciences.
This heightened potency is a likely contributor to a rise in accidental overconsumption among older adults. A Canadian study examining emergency room visits before and after nationwide cannabis legalization revealed a nearly threefold increase in cannabis poisoning cases among individuals over 65. Dr. Das succinctly summarizes the shift: "There are so many different formulations and so many different strengths. This is really not the cannabis of the ’70s."
Cardiovascular and Cognitive Risks for Seniors
Emerging research suggests a correlation between regular cannabis use and an increased risk of cardiovascular disease, a finding of particular concern for older adults, for whom heart disease remains the leading cause of mortality in the United States.
Dr. Joseph Wu, director of the Stanford Cardiovascular Institute, highlighted that his research team’s studies in animal models have shown THC to induce inflammation in blood vessels. Epidemiological research has further linked cannabis use to several forms of heart disease in humans, with studies indicating that regular use is associated with a 29% increase in heart attack risk and a 20% increase in stroke risk.
While these risks are generally lower than those associated with heavy tobacco or alcohol consumption, the co-occurrence of cannabis use with these other substances can exacerbate cardiovascular dangers. Furthermore, smoking cannabis has been implicated in an increased risk of lung cancer and cancers of the head and neck. Dr. Wu noted that smoking and vaping appear to promote more inflammation than edible products, though edibles are not without their own risks. "There is no safe amount of cannabis," he stated. "Low doses and occasional use are still associated with vascular inflammation. Abstinence is the safest option for heart health."
Beyond cardiovascular concerns, Theisen observes other potential complications in older patients using cannabis, including dizziness, confusion, falls, and the exacerbation of cognitive issues like dementia. Older adults metabolize cannabis more slowly than younger individuals, meaning the drug can persist in the system longer, leading to prolonged and potentially unexpected effects. This slower metabolism also heightens the risk of dangerous interactions with prescription medications.
One such interaction involves cannabidiol (CBD), a non-intoxicating cannabis compound. CBD can interfere with enzymes crucial for metabolizing certain medications, such as blood thinners. This interference can lead to elevated drug levels in the body, increasing the risk of bleeding. In some instances, cannabis use may also diminish the effectiveness of essential medications.
Addiction Potential: A Misunderstood Risk
A prevalent misconception is that cannabis is not addictive. However, Dr. Das counters this with research indicating that approximately 30% of regular cannabis users may develop cannabis use disorder. This condition is diagnosed based on the extent to which cannabis use negatively impacts an individual’s daily life, manifesting in withdrawal symptoms, the need for increasing doses, or interference with personal relationships and responsibilities.
Although cannabis addiction rates are lower than those for alcohol, Dr. Das points out that many healthcare providers do not routinely inquire about cannabis use among older adults. "I’m noticing that older adults may not necessarily be disclosing cannabis use to their providers unless specifically asked," she said. "This isn’t a population we traditionally think about in terms of using cannabis." This suggests that many older adults might be receiving care without their healthcare providers being aware of their cannabis consumption, potentially leading to unaddressed risks.
For individuals seeking to reduce or cease their cannabis use, open communication with a physician or addiction specialist is paramount. Therapies like cognitive behavioral therapy have demonstrated effectiveness in managing substance use disorders. "Empowering individuals by helping them understand the criteria of a substance use disorder can then help them decide, ‘Is this something I want to talk about?’" Dr. Das explained. "On the clinician side, we can do a lot to make substance use part of the conversation. What are they using the cannabis for? And if somebody wants to stop using, we need to stick with them through the difficult part of stopping."
Dr. Padula’s research is shedding light on the neurological underpinnings of addiction, particularly how the brain responds to environmental cues in individuals with cannabis use disorder. Her functional MRI studies have revealed that individuals who relapse after treatment often exhibit heightened sensitivity to drug-related stimuli in their environment, underscoring the complex nature of addiction and recovery.
Limited Evidence for Widespread Medical Claims
While research indicates that different age groups may use cannabis for distinct reasons, the evidence supporting many of its purported medical benefits for older adults remains limited. A 2017 study led by Dr. Padula found that adults aged 18-30 were more inclined to use cannabis for boredom or social reasons. Middle-aged users frequently cited insomnia, while adults aged 51-72 often reported using cannabis for cancer, chronic pain, or other long-term medical conditions.
It is crucial to note that the Food and Drug Administration (FDA) has not approved cannabis itself for general medical treatment. However, two cannabis-related compounds have received FDA approval for specific uses: CBD for certain forms of childhood epilepsy, and dronabinol, a synthetic cannabinoid, for managing nausea and appetite loss in patients with cancer or HIV/AIDS. Cannabis compounds have also shown efficacy for muscle spasms associated with multiple sclerosis, a use recognized in some countries but not yet in the United States.
Despite the widespread marketing of CBD products for pain, sleep, anxiety, and substance use disorders, robust scientific evidence to support many of these claims is still developing. Research into cannabis for chronic pain has yielded mixed results, with some studies reporting pain relief while others observe significant placebo effects. The American Psychiatric Association, with input from Dr. Das, has issued a statement opposing cannabis as a psychiatric treatment due to a lack of evidence demonstrating its effectiveness for psychiatric disorders.
However, in the realm of palliative care for patients facing life-limiting illnesses, Theisen observes a different dynamic. Many of her patients utilize cannabis to manage cancer-related symptoms, particularly pain, seeking alternatives to opioid medications that carry risks of serious side effects and addiction. Studies suggest that patients with chronic pain who use cannabis may reduce their opioid consumption. Theisen also notes that many patients find a sense of well-being from cannabis use. "THC has gotten a bad rap over the years, but in very small doses it can be therapeutic," she remarked. "There’s also a lot of stigma around its effects of euphoria. In our patients who may have months to a few years to live, still being able to experience joy is really important."
The Imperative of Honest Medical Dialogue
Despite ongoing debates about the precise medical utility of cannabis, Stanford Medicine experts universally agree on one critical point: older adults must engage in open and honest conversations with their healthcare providers before considering cannabis use. Theisen strongly advocates for patients to consult medical professionals rather than relying on advice from dispensary staff or experimenting without guidance.
In the early years of cannabis legalization, Theisen frequently encountered patients who inadvertently consumed excessively high doses of THC edibles due to a lack of proper instructions, sometimes leading to emergency department visits or a negative perception of cannabis’s potential benefits. "Patients would sometimes end up in the emergency department, or they would not want to take it again because they thought, ‘This isn’t going to work for me,’" she recounted.
Accessing reliable information about cannabis remains a challenge. Healthcare providers can play a vital role in helping patients assess the appropriateness of cannabis, explore alternative treatments, and identify potential risks related to their existing medical conditions or medications.
"Your primary care physician will know the constellation of your medical conditions and other medications you might be on," Dr. Padula advised. "Talking to your doctor and letting them know not only what you’re prescribed, but what you’re using recreationally, will help formulate a way to do it in as safe a manner as possible." This collaborative approach is essential for navigating the complex terrain of cannabis use among older adults, ensuring their well-being and mitigating potential harm.
