As cannabis legalization continues its expansive march across the United States, a demographic once considered on the fringes of marijuana use is now embracing it at increasing rates: older Americans. This trend, however, is accompanied by a critical warning from experts at Stanford Medicine, who emphasize that today’s cannabis products are dramatically more potent than those widely available in previous decades, and their use among seniors carries significant, often underestimated, health risks. Eloise Theisen, a geriatric nurse practitioner specializing in cannabis therapy at Stanford Medicine, found herself unexpectedly at the forefront of this issue. Her personal journey with medical cannabis began after a severe car accident left her grappling with chronic pain that eluded conventional treatments. Upon returning to her work in an oncology clinic, Theisen observed a widespread, yet largely unsupervised, interest in cannabis among her patients. "I found that our patients were going to use it whether their providers approved of it or not," Theisen recounted. "Many of our patients were older, and they had risks that needed to be evaluated and addressed before they started using cannabis." This firsthand experience highlighted a critical gap in medical guidance for a growing patient population. The Escalating Use of Cannabis Among Seniors The rise in both medical and recreational cannabis consumption is a national phenomenon, with adults aged 65 and older showing a notable uptick in engagement. This demographic is increasingly turning to cannabis to alleviate conditions such as chronic pain, insomnia, and anxiety. However, according to Smita Das, MD, PhD, a clinical associate professor of psychiatry and behavioral sciences at Stanford Medicine, there is no widespread medical consensus that cannabis is an effective treatment for these prevalent ailments. The unique physiological characteristics of older adults amplify the risks associated with regular cannabis use. These include a heightened susceptibility to heart disease, certain cancers, addiction, cognitive impairment, and potentially dangerous interactions with prescription medications. Compounding these concerns is the sheer potency of contemporary cannabis products, which far surpasses the marijuana many individuals may have encountered in their youth, thereby increasing the likelihood of accidental overconsumption and adverse effects. Understanding the Potency Shift: A New Era of Cannabis The legal landscape of cannabis has transformed dramatically. As of early 2024, medical marijuana is legal in 40 states and the District of Columbia, while recreational cannabis is permitted in 24 states and D.C. Despite this expansion, regular cannabis use among seniors, while still relatively low, is experiencing a rapid ascent. Data from the National Survey on Drug Use and Health indicated that in 2023, approximately 7% of adults over 65 reported recent cannabis use, a substantial increase from less than 5% in 2021. This surge in use occurs against a backdrop of an unprecedented increase in cannabis potency. In the 1970s, the average tetrahydrocannabinol (THC) content – the primary psychoactive compound in marijuana – hovered between 1% and 4%. Today, legal cannabis flower typically averages around 20% THC, with some strains reaching as high as 35%. The potency issue is further exacerbated by the availability of highly concentrated products such as oils, edibles, and extracts, which can contain THC levels approaching 90%. Even more concerning are synthetic marijuana products, often marketed as “spice” or “K2,” which are far stronger and have been linked to severe health crises, including cardiac events. While these synthetic products are illegal in California and many other jurisdictions, their existence underscores the evolving and often dangerous landscape of cannabis products. "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," stated Claudia Padula, PhD, assistant professor of psychiatry and behavioral sciences. This substantial increase in THC concentration is believed to contribute to a rise in accidental overconsumption among older adults. A Canadian study examining emergency room visits before and after nationwide cannabis legalization revealed a near tripling of cannabis poisoning cases among individuals over 65. "There are so many different formulations and so many different strengths," Dr. Das observed. "This is really not the cannabis of the ’70s." Cardiovascular and Cognitive Risks: A Looming Threat Emerging research continues to shed light on the potential cardiovascular risks associated with regular cannabis use. Joseph Wu, MD, PhD, director of the Stanford Cardiovascular Institute, expressed particular concern for older adults, given that heart disease remains the leading cause of mortality in the United States. Dr. Wu’s research team has observed, through animal studies, that THC can induce inflammation in blood vessels. Epidemiological research in humans has also correlated cannabis use with an increased incidence of heart attacks and strokes. Studies suggest that regular cannabis use is associated with a 29% higher risk of heart attacks and a 20% increased risk of stroke. While these risks may appear lower than those associated with heavy tobacco or alcohol consumption, Dr. Wu cautioned that many cannabis users also engage with these other substances. The synergistic effect of combining cannabis with tobacco or alcohol could further elevate cardiovascular dangers. Furthermore, smoking cannabis has been linked to an increased risk of lung cancer and cancers of the head and neck. Dr. Wu noted that smoking and vaping cannabis appear to promote more inflammation than edible products, though edibles are not without their own risks. "There is no safe amount of cannabis. Low doses and occasional use are still associated with vascular inflammation," he emphasized. "Abstinence is the safest option for heart health." Beyond cardiovascular concerns, Theisen is vigilant about 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, leading to prolonged drug effects and a greater likelihood of interactions with prescription medications. A notable example is cannabidiol (CBD), a non-intoxicating cannabis compound. CBD can interfere with enzymes responsible for drug metabolism, particularly affecting medications like blood thinners. This interference can elevate drug levels in the body, increasing the risk of bleeding, especially after falls or injuries. In some instances, cannabis use may also diminish the efficacy of vital medications. The Reality of Cannabis Addiction in Seniors A pervasive misconception suggests that cannabis is not addictive. However, Dr. Das and a growing body of research indicate otherwise. Studies estimate that approximately 30% of regular cannabis users may develop cannabis use disorder, a condition characterized by the drug’s detrimental impact on daily life, including withdrawal symptoms, escalating tolerance, and interference with personal relationships and responsibilities. Although cannabis addiction rates are lower than those for alcohol, Dr. Das pointed 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. This isn’t a population we traditionally think about in terms of using cannabis," she explained. "If someone comes to me for another reason such as depression or alcohol use disorder, I might be the first person who has asked them about their cannabis use." For individuals struggling 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. Dr. Padula’s ongoing research utilizes functional MRI scans to investigate how the brain responds to environmental cues in individuals with cannabis use disorder and other addictions. Her findings suggest that individuals who relapse after treatment often exhibit heightened sensitivity to drug-related stimuli in their surroundings. This insight could pave the way for more targeted and effective therapeutic interventions. Potential Benefits and Limited Evidence: A Nuanced Picture Research indicates that different age groups utilize cannabis for distinct reasons. A 2017 study led by Dr. Padula involving medically licensed cannabis users in San Francisco found that younger adults (18-30) were more likely to use cannabis for boredom or social reasons. Middle-aged users frequently cited insomnia, while adults aged 51-72 commonly reported using cannabis for cancer, chronic pain, or other long-term medical conditions. While the Food and Drug Administration (FDA) has not approved cannabis itself for broad medical treatment, it has sanctioned two cannabis-related compounds: CBD for certain forms of childhood epilepsy and dronabinol (a synthetic cannabis compound) for nausea and appetite loss in patients undergoing cancer treatment or living with HIV/AIDS. Cannabis compounds have also shown promise for managing muscle spasms associated with multiple sclerosis, leading to its approval for this purpose in some countries, though not yet in the United States. CBD products are widely marketed for pain, sleep disturbances, anxiety, and substance use disorders, yet the scientific evidence supporting many of these claims remains limited. Research into cannabis for chronic pain has yielded mixed results, with some studies reporting pain relief while others note significant placebo effects. Dr. Das, contributing to a statement from the American Psychiatric Association, noted the lack of evidence supporting cannabis as an effective treatment for psychiatric disorders. However, Theisen’s work with palliative care patients facing life-limiting illnesses presents a different perspective. Many of these patients use cannabis to manage cancer-related symptoms, seeking alternatives to opioid medications that carry risks of serious side effects and addiction. Research suggests that patients with chronic pain who use cannabis may reduce their opioid consumption. Theisen also observes that many patients find comfort and 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 stated. "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 Open Dialogue Between Patients and Physicians 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 using cannabis. Theisen strongly advocates for patients to seek guidance from medical professionals rather than relying on advice from dispensary staff or experimenting without supervision. During the initial years of cannabis legalization, she frequently encountered patients who inadvertently consumed excessively high doses of THC edibles due to a lack of proper instructions, sometimes resulting in emergency room visits or a permanent aversion to cannabis. "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 recalled. Accurate and reliable information about cannabis can be challenging to find. Physicians play a crucial role in helping patients assess the appropriateness of cannabis for their individual needs, explore alternative treatments, and identify potential risks associated with pre-existing medical conditions or current 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 proactive approach is essential to navigating the complex landscape of cannabis use and ensuring the well-being of older Americans. Post navigation Caffeine Reverses Sleep Deprivation’s Impact on Social Memory by Restoring Key Brain Pathway
