Cannabis Science: What to Think?


Alan was disoriented and his words had been not creating sense. His wife believed he could possibly be possessing a stroke, so she took him to the emergency area exactly where he was observed by the on-contact neurologist. When asked, Alan admitted to making use of cannabis on a standard basis for numerous years. The neurologist then brought him a printout with the title: “Marijuana Use Related with Enhanced Threat of Stroke, Heart Failure.” That was when I got the contact asking me if this was for real.

I have not observed this risky trend in my clinical practice, but numerous of my sufferers have utilised cannabis for numerous years so I was motivated to track down the referenced short article and overview it. If this was a valid concern, I wanted to know so I could inform sufferers about the risk.


A valid study can inform, enrich, and save lives. Poor research can generate worry and ignorance. The bias can lean either pro or con. Either way detracts from our understanding of cannabis and our capability to offer sufferers with the finest care. I obtained a copy of the original short article and reviewed it carefully.

The very first paragraph gave me a clue. “…cannabis is…the most extensively cultivated, trafficked, and abused drug…” (emphasis added)

I had study comparable statements in other scientific articles:

  • Cannabis remains one particular of the world’s most extensively utilised substances of abuse amongst pregnant females.” (emphasis added)
  • “Despite growing public overall health issues, cannabis remains the most frequently utilised illicit drug…” (emphasis added)

What do all these very first paragraphs in published scientific articles have in prevalent? Every one particular reveals a prejudice that tends to make the rest of the information that follows significantly less trustworthy. Due to the fact cannabis has been illegal and vilified for so numerous years, numerous publications assume harm even prior to they are written.

Sufferers ARE Seeking FOR ANSWERS

The scientific literature is teeming with new publications just about every week reporting on cannabis, cannabinoids, and other medicinal utilizes for the plant. Some of these research are effectively performed, but how do you know which are worthwhile and which are faulty? Scary headlines like “Cannabis Use Predicts Threat of Heart Failure” are dramatic, and normally circulate extensively in the press and on social media.

Most overall health care providers know tiny about the healthcare use of cannabis they are not taught the endocannabinoid program in healthcare schools and numerous steer clear of this sensitive subject altogether. Sufferers are educating themselves the finest they can by reading news articles and reviewing scientific research created readily available on the net, but not every thing we study is precise and not just about every study is effectively-made. Right here are a couple of recommendations to assist you inform the distinction in between valid details and that which really should be taken with a grain of salt.

ANIMAL vs. HUMAN Research

A study of worth to actual people today reports on a sample that is representative of most human beings. Humans are not mice, so valid conclusions shaping clinical care can not be reliably primarily based on how mice respond to cannabis. This does not imply that details derived from mice, rats, pigs or other animals is not valuable, but the finest we can say about animal research is that additional investigation may possibly be indicated.


“Associations in between standard cannabis use and each mental illness and lung cancer have been effectively established.” [1] This is an untrue statement. Dr. Donald Tashkin at UCLA made a study intending to prove that smoking cannabis was related with improved situations of lung cancer.

To his excellent surprise he located that this was not correct, and sooner or later published an short article that indicated just the opposite. [2]  False statements primarily based on poorly made research are occasionally referenced as reality, top to additional poor conclusions. Supporting a hypothesis with weak science is normally an indication of prejudgment.


“Mortality post [myocardial infarction] may possibly in addition be improved in cannabis users…” [1] This statement was utilised in a scientific short article reporting on the damaging effects of cannabis in the cardiovascular program. The use of the word ‘may’ right here tends to make this an opinion, not a fact.

It is also contradicted by other information. Appear out for words like “may” or “could” as they indicate a guess, assumption, or opinion rather than a reality backed by observation. The accuracy of the above statement is questionable. In 2018 Johnson-Sasso [3] published a effectively-performed study concluding: “(Our) benefits recommend that, contrary to our hypothesis, marijuana use was not related with improved danger of adverse quick-term outcomes following AMI. In addition, marijuana use was related with decreased in-hospital mortality post-acute myocardial infarction.”


Science research humans when probable, but choice of subjects is tricky, in particular when studying the effects of cannabis. As extended as the plant is federally illegal and socially suspect, most people will be apprehensive about disclosing details connected to their use.

In numerous research, details is gathered by asking sufferers if they use cannabis, or any illicit substances (self-reporting). The substances are normally listed: “Have you utilised any of the following: amphetamine, marijuana, methadone, heroin, LSD, PCP, cocaine, other?” Not every person is going to admit to making use of a substance incorporated in that list. Would you?

This challenge was clearly illustrated in a study performed in 1995. [4] This investigation collected information from each self-reports and blood tests. When tested, 585 females tested constructive for THC, but only 31% of these females had self-reported use of cannabis. As anticipated, self-reporting clearly carries the danger of beneath-reporting. If information is collected only on these who disclose the individual use of an illegal substance, that information will be skewed.

Lab testing to choose subjects has limitations as effectively. Serum drug tests may possibly underestimate the use of cannabis for the reason that the THC metabolite they test for is only present for a quick period of time. A study topic could have utilised cannabis final week, or a couple of days ago, and no longer test positive.

Choice skewing leads to statements like, “Compared with non-cannabis customers, cannabis customers had been older and predominantly guys [and]…had an improved prevalence of most danger variables like hypertension, tobacco use, and alcohol use.” [1]  This is most most likely correct for that study’s choice, but not precise for the general population.


Numerous, but undoubtedly not all, who use cannabis also use other substances that contain tobacco and alcohol. Separating out the subjects who are only impacted by cannabis is tricky but ought to be performed accurately for excellent information on the effects of cannabis alone. Due to the fact this process is so difficult, numerous study benefits are weakened by confusing the effects of extra than one substance.


WE Want InformationProperlyCOLLECTED AND ProperlySTATED

It is significant to overview scientific publications meticulously and think about any weaknesses stated or implied. The dangers and advantages of cannabis as medicine require to be recognized so the plant can be utilised safely to everyone’s finest benefit. Worry and social attitudes have no spot in effectively-performed scientific research. Unscientific enthusiasm for a extensively utilised herb has no spot in the science either. For cannabis to be trusted and appropriately utilised as medicine, we require impartial facts–well-collected and well-stated.

Fortunately, Alan had not had a stroke. It appeared he had a ‘TIA,’ which is a transient loss of blood flow to the brain with no extended-term harm performed. But they kept him overnight for tests and to make positive he was protected to discharge. He went house the subsequent day and continued to use cannabis, recognizing that the details shared with him by a effectively-which means neurologist was not necessarily valid. For him, the individual advantages had been worth the possible risks.

Stacey Kerr, M.D. is a teacher, doctor, and author living and operating in Northern California. Soon after a number of years operating with the Society of Cannabis Clinicians, and co-creating the very first extensive on the net course in cannabinoid medicine, she now serves as Healthcare Director for Hawaiian Ethos. Dr. Kerr is a Project CBD contributing writer. This short article was initially published by Hawaiian Ethos.


1.    Kalla et al. Cannabis use predicts dangers of heart failure and cerebrovascular accidents. J Cardiovasc Med, 2018, 19:000-000 doi:10.2459/JCM.0000000000000681

two.    Tashkin. Effects of Marijuana Smoking on the Lung. Ann Am Thorac Soc Vol 10, No three, pp 239–247, Jun 2013

three.    Johnson-Sasso CP et al. Marijuana use and quick-term outcomes in sufferers hospitalized for acute myocardial infarction. PLoS 1 13(7): e0199705. 2018.

four.    Shiono et al. The Influence of cocaine and marijuana use on low birth weight and preterm birth: A multicenter study. Am J Obstet Gynecol. 1995 Jan172(1 Pt 1):19-27.


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