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Why You Shouldn’t Consume Cannabis

written by a cannabis delivery company in Portland, Oregon

We love cannabis, weed, marijuana, ganjas and whatever name you want to call it. We love talking about it sharing why we think it’s awesome, but we also made a promise to give you the information you need to make an informed decision about your own consumption.

On one hand, that means giving you the cannabinoid/terpene contents and telling you how a strain makes us feel, but on the other, it also means talking about the potential downsides of smoking marijuana. As much as we want to tell you that it’s 100% safe, no one has ever become addicted or experienced any adverse effects, that just isn’t the truth. There are some real risks associated with cannabis use,—some people should avoid it entirely,—and we’re going to walk you through everything you need to know.

Throughout all of this, we want to remind you that none of us at Pot Mates are doctors, so nothing we tell you should be construed as medical advice. The best person to talk to about whether or not to consume cannabis is your primary care provider, which is not Pot Mates.

People Who Should Avoid Cannabis 

Under 25 year olds

Look familiar? You get one free with every cannabis purchase.

Look familiar? You get one free with every cannabis purchase.

It is so important that children avoid cannabis that every cannabis sale in the state of Oregon is required by law to include this notice. When cannabis extracts are infused into chocolates, cookies, sodas, and other treats, it’s easy for children to accidentally eat something that can make them sick. Symptoms include disorientation, trouble walking or sitting up and difficulty breathing. Remember, we’re not doctors, so if your child ingests cannabis, call Poison Control at 800-222-1222or visit

If children are going to intentionally try marijuana products, it’s usually to emulate someone they know and respect,—likely a family member, or a close friend. If that’s you, take the opportunity to educate them about the wisdom of waiting until they’re older. The negative effects of marijuana on mental health are greatest during development, particularly between the ages of 10 and 24, and these risks are higher the younger the person is, how frequently they use marijuana, and how much THC is in it.[1] These effects may include decreased IQ, attention deficits, poor academic achievement, suicide ideation, and an increased risk of schizophrenia.

There is also evidence that adolescents who consume high-potency concentrates like vape pens or dabs are at a higher risk for developing marijuana dependency[2], which is apparently a real thing that we’ll discuss in the Personal Risks section below.

Pregnant People

Babies whose mothers smoked weed while they were pregnant are more likely to be born premature or underweight and admitted to a neonatal intensive care unit.[3] Cannabinoids and terpenoids are capable of passing through the placenta to the fetus. This can contribute to developmental problems after birth as well. Although it is transferred in smaller quantities, babies also absorb THC directly from breastmilk. THC enters breastmilk within twenty minutes and can be detected up to six days later, so it’s probably best to abstain from cannabis altogether while breastfeeding.[4]

People with psychiatric disorders

If you have a personal or a family history of psychiatric disorders (i.e. psychosis, schizophrenia, anxiety or mood disorders,) then you may also want to avoid cannabis as well. Higher levels of cannabis use have been shown to increase the risk of psychotic episodes for people with psychosis or schizophrenia.[5] Similarly, people with anxiety who use cannabis are likely to have more severe symptoms than those who don’t, and they struggle more to improve during treatment.[6]

Bipolar disorder is another risk factor for cannabis. Studies have shown that people who use cannabis can expect a higher number of both manic and depressive episodes and an earlier age of onset.[7]

People with cardiovascular/cerebrovascular disease

Cannabis should not be used by people who have severe cardiovascular or cerebrovascular disease. It can increase the incidence of occasional hypertension, fainting, tachycardia,—even heart attacks and strokes.[8] These can constitute serious medical emergencies.

People with liver/renal disease

Similarly, people with severe liver diseases should avoid smoking marijuana because it has been shown to increase the risk and severity of steatosis, or fatty liver disease.[9]


Informed consent is important, so please don’t give animals cannabis. There is not enough research to understand the effect it can have because every animal’s endocannabinoid system is different, but at least in dogs, marijuana has been shown to cause dribbling urine, low blood pressure, and low heart rate as well as stumbling or falling.[10] If you think your pet may have ingested marijuana products, you can call the Pet Poison Hotline at 855-764-7661 or visit their page on marijuana here.

What Are the Personal Risks of Consuming Cannabis?

Cognitive Impairment

Cannabis directly interferes with both your working memory (short-term) and your episodic memory (long-term).[11]This can have a negative effect on your hand-eye coordination, your reaction time, and your ability to remember both things that just happened and things you should remember from a while ago. [12] Short attention span is another side effect, making it hard to follow a single train of thought or focus on one thing at a time. You know what we are talking about here. Studies have shown that this impairment can last as many as twenty-four hours after using.[13] You can read more here about the different stages of being high and how they can affect you

Motor vehicle accidents

Because THC can act as a central nervous system depressant, people who use marijuana are 20–30% more likely to be involved in a motor vehicle accident than people who don’t.[14] Foggy short-term memory makes it difficult to keep track of hazards, and unfocused attention drags down response time to sudden changes, like a car merging into your lane without signaling, or a bicycle legally crossing an intersection. 

This is a good reason to avoid combining cannabis with alcohol or any other CNS-depressant medication, as these can compound the effect even further.[15]

Mental Health

Let’s pause for a moment and talk about an important distinction to remember when processing all of this information. Many of these studies establish a correlation between cannabis use and a given outcome, be it a mental disorder, a birthweight, or a psychomotor skill test. Despite these correlations, the fact that both cannabis and the given outcome were present at the same time does not mean that cannabis caused that outcome,—at least, not necessarily. People who use marijuana are more likely to be involved in an accident, but that could be the result of something else they also have in common. Without more research, we just can’t be sure.

However, there are significant correlations between heavy cannabis use and psychosis, specifically schizophrenia.[16] Does this mean that smoking pot causes schizophrenia, or that people with schizophrenia tend to self-medicate with marijuana? We don’t know for sure, but that data definitely gives some good reasons to avoid it if you or your family has a history of schizophrenia.

There are also correlations between adolescent use and the development of depression, anxiety, and other related mood disorders.[17] In fact, while some teenagers claim they are self-medicating to manage the symptoms of depression and anxiety, weed can often mimic the very symptoms they are trying to treat. This could mean that people with depression and anxiety are more likely to use cannabis, or it could mean that cannabis causes people to experience depression and anxiety. 

Cannabis use has also been associated with an increase of suicidal ideation.[18] These thoughts are often intrusive and unwanted, but they are not unmanageable. If you find yourself preoccupied with your own death, please talk to a friend or family member about your feelings. You can also call 800-273-8255 or visit

Tolerance and Dependence

The more weed you smoke, the more you develop a tolerance for it, and thus the more that you need to smoke in order to feel the same level of subjective high. The downside of this is that you inevitably end up increasing your THC consumption as your tolerance goes up, and this can add up to problems down the line. At least one study found that daily or near daily cannabis use can interfere with neurocognitive functions even after the initial phase of intoxication. In other words, daily or near-daily use can leave you as impaired as if you had just smoked, even if you haven’t.[19]

Tolerance can lead to a psychological and even physical dependence. For the longest time, we thought people couldn’t become physically addicted to weed, but it turns out that there are clear withdrawal symptoms that are immediately apparent within one to two days of quitting cannabis entirely. These symptoms include cravings, anxiety, irritability, headache, restlessness and decreased appetite or weight loss.[20] The first five days are the worst, but most of these symptoms resolve within one to two weeks. 

There aren’t any approved drugs for managing the symptoms of cannabis withdrawal, but there is other help available. If you think your cannabis use is starting to interfere with your work or home life, you can call the Delphi Health Group Drug Recovery Hotline at 888-979-9625, or visit them here.


All this isn’t to say that marijuana is bad, just that there are risks. Compared to the incredible list of potential harms associated with other drugs such as tobacco or alcohol, cannabis does very little damage. It hasn’t been correlated to lung cancer[21], it’s unlikely to be a gateway drug[22], and it won’t destroy your liver like long-term alcohol consumption.[23]But we would be lying if we told you it’s harmless, and now you know what to watch out for to be a more informed, responsible cannabis user. The best kind.

Roughly 50% of people in the United States expresses curiosity about cannabis, but only about 20% of people actually partake. It is perfectly normal to be curious about marijuana and it is also perfectly normal to be one of the 80% of people that do not participate. You should never feel pressured to consume cannabis.

If you want to learn more, we wrote an article about how to stay safe when you try cannabis.

[1]                               Long-term consequences of adolescent cannabinoid exposure in adult psychopathology 

[2]                               Associations Between Butane Hash Oil Use and Cannabis-Related Problems

[3]                               Prenatal Exposure to Cannabis and Maternal and Child Health Outcomes: A Systematic Review and Meta-Analysis

[4]                               Marijuana Use by Breastfeeding Mothers and Cannabinoid Concentrations in Breast Milk

[5]                               Meta-analysis of the Association Between the Level of Cannabis Use and Risk of Psychosis

[6]                               Association of Cannabis With Long-Term Clinical Symptoms in Anxiety and Mood Disorders: A Systematic Review of Prospective Studies

[7]                               Bipolar Disorder and Co-Occurring Cannabis Use Disorders: Characteristics, Co-Morbidities and Clinical Correlates

[8]                               Cannabis Use: Signal of Increasing Risk of Serious Cardiovascular Disorders

[9]                               Role of Cannabinoids in the Development of Fatty Liver (Steatosis)

[10]                             Marijuana, Cannabidiol & Dogs

[11]                             Effects of marijuana on neurophysiological signals of working and episodic memory

[12]                             Effects of marijuana on neurophysiological signals of working and episodic memory

[13]                             The Health Effects of Cannabis and Cannabinoids

[14]                             The Effects of Cannabis Intoxication on Motor Vehicle Collision Revisited and Revised

[15]                             The Effect of Alcohol, THC and Their Combination on Perceived Effects, Willingness to Drive and Performance of Driving and Non-Driving Tasks

[16]                             Meta-analysis of the Association Between the Level of Cannabis Use and Risk of Psychosis

[17]                             Association of Cannabis With Long-Term Clinical Symptoms in Anxiety and Mood Disorders: A Systematic Review of Prospective Studies

[18]                             Bipolar Disorder and Co-Occurring Cannabis Use Disorders: Characteristics, Co-Morbidities and Clinical Correlates

[19]                             Cannabis and tolerance: acute drug impairment as a function of cannabis use history

[20]                             Abstinence Phenomena of Chronic Cannabis-Addicts Prospectively Monitored During Controlled Inpatient Detoxification: Cannabis Withdrawal Syndrome and Its Correlation With delta-9-tetrahydrocannabinol and -Metabolites in Serum

[21]                             Cannabis Smoking and Lung Cancer Risk: Pooled Analysis in the International Lung Cancer Consortium

[22]                             Marijuana and Medicine: Assessing the Science Base

[23]                             Health Risks And Benefits Of Alcohol Consumption

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