For the past 27 years, working as an addiction psychiatrist, I have struggled with big industries that push their products more for their financial gain rather than the best interests of the clients they serve. The most disconcerting piece occurs when physicians or other treatment providers or governmental entities appear to be influenced by big industry, touting the party line and minimizing any downsides to the product. I have experienced this with the tobacco industry, the pharmaceutical industry and now with the marijuana industry.
It is clear to me that wherever it happens, the push to legalize medical marijuana is simply a back-door effort, by industry, to legalize retail marijuana. However, the lack of any regulations on the potency of THC in marijuana or marijuana products in Colorado has allowed the cannabis industry to increase the potency of THC to astronomical proportions, resulting in a burgeoning public health crisis.
The potency of THC in currently available marijuana has quadrupled since the mid-1990s. The marijuana of the 1980s had <2% THC, 4.5% in 1997, 8.5% in 2006 and by 2015 the average potency of THC in the flower was 17%, with concentrated products averaging 62% THC.
Sadly, the cannabidiol (CBD) concentrations in currently available marijuana have remained the same or decreased. CBD is the component of marijuana that appears to block or ameliorate the effects of THC. Plants that are bred to produce high concentrations of THC cannot simultaneously produce high CBD. Higher-potency THC has been achieved by genetically engineering plants to product more THC and then preventing pollination so that the plant puts more energy into producing cannabinoids rather than seeds. This type of cannabis is referred to as sinsemilla (Spanish for without seed). (It has also been referred to as “skunk” due to its strong smell.)
In my view, this is no different than when the tobacco industry increased the potency of nicotine by genetically engineering tobacco plants to produce more nicotine and then used additives like ammonia to increase the absorption of nicotine. Industry’s efforts to increase the potency of an addictive substance seem to be done purely with the idea of addicting as many people as possible to guarantee continued customers. This certainly worked for the tobacco industry. And we have increasing evidence that high potency THC cannabis use is associated with an increased severity of cannabis dependence, especially in young people.12
Although marijuana has been used for thousands of years for various medical conditions, we have no idea if the benefit comes from the THC or CBD or one of the other multiple cannabinoids present in marijuana, or a combination. And we have no idea how much is needed or how often. Most of the research indicates that it is likely the CBD that is more helpful but we obviously need research on this. There is no evidence that increasing the potency of THC has any medical benefits. In fact, a study on the benefits of smoked cannabis on pain actually demonstrated that too high a dose of THC can cause hyperalgesia – similar to what is seen with high dose opiates – meaning that the person becomes more sensitive to pain with continued use. They found that 2% THC had no effect on pain, 4% THC had some beneficial effects on chronic pain and 8% resulted in hyperalgesia.3
The discovery of the “active component” in marijuana that makes it so desirable is a fairly recent phenomenon. THC and CBD were first discovered in 1963 in Israel.4
Because cannabis was made a DEA schedule I drug in 1970, very little research has been done on cannabis in the United States and most of the indications for medical marijuana have very little good research backing up the use. The chemical that is made by the body and fits the receptor which accommodates THC was discovered in 1992.5
The researcher named the chemical anandamide which means “supreme joy” in Sanskrit.
However, it turns out that the endocannabinoid system plays a very significant role in brain development that occurs during childhood and adolescence. It controls glutamate and GABA homeostasis and plays a role in strengthening and pruning synaptic connections in the prefrontal motor cortex. The consequences of using the high potency THC products during this period, especially without the protective benefits of CBD, are multifaceted and include disturbance of the endocannabinoid system, which can result in impaired cognitive development, lower IQ and increased risk of psychosis.
There is also evidence that marijuana use contributes to anxiety and depression. A very large prospective study out of Australia tracked 1600 girls for 7 years and found that those who used marijuana every day were 5 times more likely to suffer from depression and anxiety than non-users.6
Teenage girls who used the drug a least once a week were twice as likely to develop depression as those who did not use. In this study, cannabis use prior to age 15 also increased the risk of developing schizophrenia symptoms.
While there definitely are people who can use marijuana responsibly without any untoward effects, similar to how some people can drink alcohol responsibly and not have any problems, there are people who are very sensitive to the effects of THC, and its use can precipitate psychosis. The higher the potency of THC the more likely this may happen and we have no idea how to predict who will be affected. In one of the first double blind randomized placebo controlled trials on smoked cannabis (maximum of 8% THC) for the treatment of pain, a cannabis naïve participant had a psychotic reaction to the marijuana in the study and this then required that all future study participants have some experience with smoking marijuana.7
This kind of makes it difficult to have “blind” unbiased participants.
A 2015 study out of London analyzed 780 people ages 18-65, 410 with first episode psychosis and 370 healthy controls, and found that users of high potency (“skunk-like”) cannabis (THC > 15%) are three times as likely to have a psychotic episode as people who never use cannabis, and the risk is fivefold in people who smoke this form of the drug every day.89 There was no association of psychosis with THC levels < 5%. Most of the marijuana in the U.S. is of the high-THC variety. Many retailers in Colorado sell strains of weed that contain 25 percent THC or more.
Sadly, Colorado has now joined several other states in approving PTSD as an indication for the use of medical marijuana. Marijuana does not “treat” PTSD any more than benzodiazepines or opiates “treat” PTSD. All these addictive drugs do is mask the symptoms, allowing the person to continue life unaffected by the memory of the trauma. However, the psychological trauma is never resolved and the individual has to continue to use the substance in order to cope. This sets the individual up for the development of addiction to the substance or the use of other addictive substances. There is absolutely no good research to support the use of marijuana for PTSD, and there is observational data that this would be a bad idea unless this use was supported by a lot more (andbetter-designed) longitudinal research.
In an excellent longitudinal, observational study from 1992 to 2011, 2,276 Veterans admitted to specialized VA treatment programs for PTSD had their symptoms evaluated at intake and four months after discharge.10
They found that those who never used marijuana or quit using while in treatment had the lowest levels of PTSD symptoms, while those who continued to use or started using marijuana after treatment had worse symptoms of PTSD. Those who started using the drug during treatment had higher levels of violent behavior too.
Those of us working in the trenches in Colorado are seeing the downsides of what our governor has called “one of the great social experiments of the 21st century.” Emergency room physicians are seeing a significant increase in people experiencing consequences from marijuana use since it was legalized. One such physician wrote a very poignant piece about his experience returning to his home town of Pueblo, Colorado where he is now practicing.11
His experiences are totally supported by the Rocky Mountain High Intensity Drug Trafficking Report, volume 4 from September 2016 which documents significant increases in marijuana related emergency department visits (49%) and hospitalizations related to marijuana (32%) compared to rates prior to retail legalization. This report also documents significant increases in the use of marijuana by youth, with Colorado youth “past month marijuana use” for 2013/2014 being 74% higher than the national average, compared with 39% higher in 2011/2012.
In Pueblo, Colorado, where I practice, it has developed into a perfect storm. According to the Healthy Kids Colorado Survey in 2015, we have the highest incidence of youth marijuana use in the state, with 30.1% reporting using marijuana in the last 30 days.
The legalization of retail marijuana seems to be reflected in the increased abuse of opiates and heroin too. In addition to the highest rates of marijuana use by youth, Pueblo has the highest rates of heroin-related deaths in the state.
This is a very disturbing correlation that needs attention. I have definitely seen in my practice that marijuana acts as a gateway drug to opiates, and to relapse to opiates after treatment if the person goes back to using marijuana. The Smart Approaches to Marijuana status report, which assesses state compliance with federal marijuana enforcement policy, following what is known as the Cole memo, documents that Colorado, four years after legalization, has failed to meet the specific DOJ requirements on controlling recreational marijuana production, distribution and use. This report documents a significant increase in drugged driving crashes, youth marijuana use, a thriving illegal black market and unabated sales of alcohol, which supports the idea that people are not using marijuana instead of alcohol but rather in addition to alcohol.
In spite of all this information, powerful people in the government of Colorado have publicly minimized the consequences. Larry Wolk, MD, the Chief Medical Officer for the Colorado Department of Public Health and Environment, has reported that he has “not seen any significant problems” with the legalization of marijuana.
Governor Hickenlooper’s response to Attorney General Sessions recent questions about compliance with the Cole Memo minimized the adolescent use of marijuana by saying that youth marijuana use in Colorado has “remained stable since legalization.” This is not true for Pueblo, but in any event, any use of marijuana by youth in Colorado should not be minimized and should be a major concern for future generations.
While there are people who believe we need to enforce federal law and go back to making marijuana illegal, I am afraid the horse is already out of the barn and cannot be put back in as we already have several states with “legal” retail marijuana and multiple more with “medical marijuana.” I cannot conceive of any way this could be reversed at this point, when the majority of society supports the legalization of marijuana.
Solutions to our marijuana problems have to be realistic to our current situation/environment. The number one solution is more education. Many people seem to lack a true understanding of the drug and all the potential negative consequences of the higher-potency THC. This is why education is so important. Adults should have the right to make their own decisions but they need informed consent, just like with any drug.
The biggest concern is with adolescent use and the developing brain. This requires a lot more education and increased efforts at prevention, early intervention and treatment. I believe society would be truly served by a federal ban on all advertising of addicting drugs including alcohol, tobacco and marijuana, as well as all pharmaceutical drugs. The decision to use a pharmaceutical medication should be between the patient and the medical professional, not influenced by big industry. We clearly have the big industries— alcohol, tobacco and marijuana—doing everything they can to influence the public and convince them to use their product.
Since we only have anecdotal evidence at this point that marijuana can aid any medical condition, I recommend eliminating “medical marijuana” and just have retail marijuana with limits on THC and regulations similar to alcohol and tobacco. This could help take away the perception, which adolescents and others have, that because is it “medical” it must be “safe.” In order to be able to say it is medical, it should go through the same standards for testing the safety and efficacy of any prescription drug.
In this vein, I believe we do need more research and that marijuana should be reclassified as a schedule II drug so this can occur. Since marijuana has been used medicinally for thousands of years, I believe that the plant deserves some true research to determine if and what parts of the plant are helpful medicinally. The reports that marijuana use resulted in less than 10% becoming addicted to it were done back in the 1990s when THC levels were <5%. Since we are seeing significant increases in people developing marijuana use disorder with the higher doses of THC, perhaps the limits on THC should be <5%.
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Editor’s note: for more information, see the pdf of the author’s talk on this topic.
- Freeman TP, Windstock AR. Examining the profile of high-potency cannabis and its association with severity of cannabis dependence. Psychological Medicine. 2015;45:3181-3189. ↩
- Hasin DS, Saha TD, Kerridge BT, et al. Prevalence of marijuana use disorders in the United States between 2001–2002 and 2012–2013. JAMA Psychiatry. 2015;72(12):1235-1242. ↩
- Wallace M et al. Dose-dependent effects of smoked cannabis on capsaicin-induced pain and hyperalgesia in healthy volunteers. Pain and Regional Anesthesia. 2007; 107:785-796. ↩
- Gaoni Y, Mechoulam R. Isolation, structure and partial synthesis of an active constituent of Hashish. Journal of the American Chemical Society. 1964;86:1646–1647. ↩
- Devane WA, Hanus L, Breuer A, Pertwee RG, Stevenson LA, Griffin G, Gibson D, Mandelbaum A, Etinger A, Mechoulam R. Isolation and structure of a brain constituent that binds to the cannabinoid receptor. Science. 1992;258:1946–1949. ↩
- Arseneault L et al.Cannabis use in adolescence and risk for adult psychosis: longitudinal prospective study. BMJ. 2002;325:1212-1213. ↩
- Ellis RJ et al. Smoked medicinal cannabis for neuropathic pain in HIV: a randomized, crossover clinical trial. Neruopsychopharmacology. 2009;34:672-680.. ↩
- DiForti M et al. Proportion of patients in south London with first-episode psychosis attributable to use of high potency cannabis: a case controlled study. Lancet Psychiatry. 2015 doi.org/10.1016/52215-0366(14)00117-5 ↩
- DiForti M et al. Daily use, especially of high potency cannabis, drives the earlier onset of psychosis in cannabis users. Schizophrenia Bulletin. 2014;40:1509-1517. ↩
- Wilkinson ST et al. Marijuana use is associated with worse outcomes in symptom severity and violent behavior in patients with posttraumatic stress disorder. J Clin Psychiatry. 2015;76:1174-1180. ↩
- Roberts B. Dangers of marijuana experienced firsthand ↩