Johny Marice
As cannabis use continues its upward trajectory across the United States, a growing number of older Americans are exploring its potential benefits. However, experts at Stanford Medicine are sounding a critical alarm: contemporary marijuana products are significantly more potent than many individuals, particularly seniors, realize, presenting a landscape fraught with potentially serious health implications. This evolving situation necessitates a deeper understanding of the risks and a more informed approach to cannabis consumption within this demographic.
The Shifting Landscape of Cannabis and Aging Populations
The demographic of cannabis users is broadening, with adults over the age of 65 increasingly turning to marijuana for relief from chronic pain, insomnia, and anxiety. This trend is occurring against a backdrop of evolving legal statuses for cannabis, with medical marijuana now legal in 40 states and the District of Columbia, and recreational use permitted in 24 states and D.C. Yet, despite this widespread availability and increasing adoption, significant gaps remain in our scientific understanding of how cannabis impacts the aging body and brain. This knowledge deficit is partly attributable to the persistent federal prohibition of marijuana, which continues to impede comprehensive research.
Eloise Theisen, a geriatric nurse practitioner specializing in cannabis therapy at Stanford Medicine, witnessed this phenomenon firsthand. Initially seeking cannabis for her own chronic pain following a severe car accident, she later observed a significant number of patients in an oncology clinic either already using cannabis or contemplating its use, often without the benefit of professional medical guidance. "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 realization underscored the urgent need for healthcare professionals to engage with older patients about cannabis use.
The Potency Paradox: Today’s Cannabis vs. Yesterday’s
A central concern articulated by Stanford Medicine experts is the dramatic increase in the potency of cannabis products available today. In the 1970s, the average tetrahydrocannabinol (THC) content – the primary psychoactive compound in marijuana – typically ranged between 1% and 4%. Fast forward to the present, and legal cannabis flower now averages around 20% THC, with some strains reaching as high as 35%. The concern escalates further when considering other product forms. Oils, edibles, and concentrates can boast THC levels approaching 90%, and the emergence of synthetic marijuana products like spice or K2, which are significantly stronger and linked to severe health issues, adds another layer of risk, although these are illegal in California and many 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 Claudia Padula, PhD, assistant professor of psychiatry and behavioral sciences at Stanford Medicine. This surge in potency is a critical factor contributing 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 adults over 65, highlighting the potential for unexpected and severe reactions. Dr. Smita Das, MD, PhD, clinical associate professor of psychiatry and behavioral sciences at Stanford Medicine, emphasized this point, stating, "There are so many different formulations and so many different strengths. This is really not the cannabis of the ’70s."
Cardiovascular and Cognitive Concerns in the Aging Brain and Body
The potential impact of regular cannabis use on cardiovascular health is a significant area of concern for older adults, given that heart disease remains the leading cause of death in the United States. Joseph Wu, MD, PhD, director of the Stanford Cardiovascular Institute, pointed to research indicating that THC can trigger inflammation in blood vessels, as observed in animal studies. Epidemiological research has also drawn connections between cannabis use and various forms of heart disease in humans, with some studies associating regular use with a 29% increase in heart attack risk and a 20% increase in stroke risk.
While these risks may be lower than those associated with heavy tobacco or alcohol consumption, Dr. Wu noted the compounding danger when cannabis is used in conjunction with these other substances, a common practice among many users. Furthermore, smoking cannabis has been linked to an increased risk of lung cancer and cancers of the head and neck. Dr. Wu cautioned 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. Low doses and occasional use are still associated with vascular inflammation," he asserted. "Abstinence is the safest option for heart health."
Beyond cardiovascular issues, Theisen expressed concern about other complications experienced by older patients using cannabis, including dizziness, confusion, falls, and the exacerbation of cognitive problems like dementia. The aging physiology plays a crucial role here; older adults metabolize cannabis more slowly than younger individuals. This means the drug can persist in the system for longer periods, potentially prolonging its effects and increasing the likelihood of adverse interactions with prescription medications.
A notable example involves cannabidiol (CBD), a non-intoxicating compound found in cannabis. CBD can interfere with enzymes responsible for metabolizing certain medications, such as blood thinners. This interference can lead to elevated drug levels in the body, thereby increasing the risk of bleeding, particularly after an injury or fall. In some instances, cannabis use may even diminish the effectiveness of essential medications.
The Overlooked Risk: Cannabis Addiction
A pervasive misconception is that cannabis is not addictive. However, Dr. Das countered this belief with emerging research suggesting otherwise. Studies indicate that approximately 30% of regular cannabis users may develop cannabis use disorder, a condition characterized by significant impairment in daily life, including withdrawal symptoms, a need for escalating doses, or cannabis interfering with relationships and responsibilities.
While cannabis addiction rates are generally lower than those for alcohol, Dr. Das highlighted that healthcare providers may 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 observed. "This isn’t a population we traditionally think about in terms of using cannabis." This oversight means that for many seniors, their primary care physician might be the first healthcare professional to broach the subject. For those struggling to reduce or cease their cannabis use, open communication with a doctor or addiction specialist is paramount. Treatments such as cognitive behavioral therapy have demonstrated efficacy in managing substance use disorders.
Dr. Padula’s ongoing research, which utilizes functional MRI scans to examine how the brain responds to environmental cues in individuals with cannabis use disorder, has revealed heightened sensitivity to drug-related signals in those who relapse after treatment. This insight underscores the complex neurological underpinnings of addiction and the challenges individuals may face when attempting to quit.
Navigating the Nuance: Potential Benefits and Limited Evidence
While the risks associated with cannabis use in older adults are substantial, the question of potential therapeutic benefits remains a complex one. Research suggests that different age groups utilize cannabis for varying reasons. A 2017 study led by Dr. Padula involving medically licensed cannabis users found that younger adults (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 important 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. Additionally, cannabis compounds have shown promise in alleviating 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 a range of ailments including pain, sleep disturbances, anxiety, and substance use disorders, 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 substantial 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 robust evidence for its efficacy in treating psychiatric disorders.
However, Theisen offers a nuanced perspective from her work with palliative care patients facing life-limiting illnesses. Many of these individuals turn to cannabis as an alternative to opioid medications, which carry significant risks of side effects and addiction, to manage cancer-related symptoms, including pain. Research has indicated that chronic pain patients who use cannabis sometimes report reduced opioid consumption. Theisen also notes that many patients find cannabis can contribute to a sense of well-being. "THC has gotten a bad rap over the years, but in very small doses it can be therapeutic," she commented. "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." This highlights a potential area where, under careful medical supervision, cannabis might offer benefits for quality of life in specific, end-of-life scenarios.
The Imperative of Open Dialogue: Doctors and Patients
Across the spectrum of opinions regarding the medical utility of cannabis, Stanford Medicine experts universally agree on one crucial point: older adults must engage in open and honest conversations with their healthcare providers before considering cannabis use. Theisen advocates for patients to seek guidance from medical professionals rather than relying on advice from dispensary staff or experimenting independently. In the early years following legalization, she frequently encountered instances of patients accidentally consuming excessively high doses of THC edibles due to a lack of proper instruction, leading to emergency room visits or a negative perception of cannabis.
Reliable and accurate information about cannabis remains a challenge to access. Healthcare providers can play a vital role in helping patients assess the appropriateness of cannabis for their needs, explore alternative treatment options, and identify potential risks associated with their 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," emphasized Dr. Padula. "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 and evolving landscape of cannabis use among older Americans, ensuring patient safety and informed decision-making.
