It’s a myth that marijuana is safe. While it has proven benefits for certain physical ailments, the drug’s effect on adolescents, especially those with psychiatric vulnerabilities, can lead to psychosis and debilitating long-term cognitive impairment. Research on the effects of marijuana on the human brain has been taking place internationally for a couple of decades. Studies show marijuana has a more negative effect on the brain than is generally understood. Even though it is from a plant source, it is a psychoactive drug with dangerous side-effects the same as any synthetic psychoactive drug.
Just because marijuana is plant-based does not mean it is safe. Its use and dosage should be guided by a doctor.
One researcher discovered that both mentally ill and normal adult test subjects experienced negative mental health side-effects. He wrote, “When THC (tetrahydrocannabinol) was administered in one trial, it caused both patients and controls to experience transient increases in cognitive impairments and schizophrenia-like… symptoms.”
Marijuana legalization has deeply concerned pediatric psychiatrists and other providers specializing in child, adolescent, and young adult mental health treatment. Up until the their early 20’s, young brains undergo radical changes as part of normal development. Neurons are “pruned” to reduce their number (yes indeed, one can have too much gray matter to function as an adult). Pruning occurs more rapidly in teenagers–think about it, a lot of nonsensical teenage behavior can be explained by this. The THC in marijuana, the part responsible for the high, interferes with the normal pruning process.
Numerous research summaries are appended below, and the dangers to adolescents are shown time and again. I find this statement extraordinarily sad:
“Increasing levels of cannabis use at ages 14-21 resulted in lower levels of degree attainment by age 25, lower income at age 25, higher levels of welfare dependence, higher unemployment, lower levels of relationship satisfaction, and lower levels of life satisfaction.”
I worked with adolescents in residential care and in the juvenile justice system who regularly used marijuana when they could. A young man on my caseload grew noticeably depressed after he started smoking regularly, and his anxiety and paranoia increased. He said that smoking helped him feel better, but he couldn’t observe what I and other social workers observed over time. Smoking marijuana, ironically, was briefly relieving him of its own side-effects.
When marijuana is ‘medical,’ a medical professional determines a safe adequate dose.
And when it is ‘recreational,’ there is no such limit… no one even realizes there should be.
A note on medical marijuana – The plant Cannabis sativa has two substances of interest:
- cannabidiol (CBD) – the molecule considered safe for a variety of treatments and approved by the American Medical Association;
- tetrahydrocannabinol (THC) – the molecule responsible for the high and the one that can produce psychotic symptoms.
Please share this information with other parents and peruse the research below. Everyone needs to know that the same warnings parents teach their kids about alcohol and illegal street drugs also apply to marijuana. It may not be possible to totally prevent your troubled child from using, especially in states where it is legal, but you can do what you can. We can’t ignore this anymore.
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Proof cannabis DOES lead teenagers to harder drugs
Daily Mail, London U.K., June 7, 2017
“The study of the lives of more than 5,000 teenagers produced the first resounding evidence that cannabis is a gateway to cocaine, amphetamines, hallucinogens and heroin.” Read the full story “Teenagers who regularly smoke cannabis are 26 times more likely to turn to other drugs by the age of 21. It also discovered that teenage cannabis smokers are 37 times more likely to be hooked on nicotine and three times more likely to be problem drinkers than non-users of the drug.”
Legal cannabis laws impact teen use
The Geisel School of Medicine at Dartmouth, NH, June 27, 2017
‘A new study has found that adolescents living in medical marijuana states with a plethora of dispensaries are more likely to have tried new methods of cannabis use, such as edibles and vaping, at a younger age than those living in states with fewer dispensaries. ” …As cannabis legalization rapidly evolves, in both medical and recreational usage, understanding the laws’ effect on young people is crucial because this group is particularly vulnerable to the adverse effects of marijuana and possesses an inherent elevated risk of developing a cannabis disorder.
Marijuana Can Permanently Lower IQ in Teens
Duke University and King College (London), August 2012
Teens who regularly smoke marijuana are putting themselves at risk of permanently damaging their intelligence as adults, and are also significantly more likely to have attention and memory problems later in life, than their peers who abstained, according to a new study conducted by Duke University and London’s King’s College. This study is among the first to distinguish between cognitive problems the person might have had before using marijuana, and those that were caused by the drug..
The research found that adults who started smoking pot as teenagers and used it heavily, but quit as adults, did not regain their full mental powers. In fact, “persistent users” who started as teenagers suffered a drop of eight IQ points at the age of 38, compared to when they were 13. Researchers noted that many young people see marijuana as a safer alternative to tobacco. A recent “Monitoring the Future” study found that, for the first time, more American high school students are using marijuana than tobacco. Lead researcher Madeline Meier, a post-doctoral researcher at Duke University, said, “Marijuana is not harmless, particularly for adolescents.”
Risks of increasingly potent Cannabis: The joint effects of potency and frequency
Joseph M. Pierre, MD; Current Psychiatry. 2017 February;16(2):14-20
Cannabis at a young age (age <15 to 18) increases the risk of developing a psychotic disorder. The accumulated evidence to date is strong enough to view the psychotic potential of Cannabis as a significant public health concern, especially a high-potency Cannabis (HPC) form of hash oil known as Cannabis “wax” or “dabs” that contains as much as 90% THC. Preliminary anecdotal evidence supports the plausibility of hyper-concentrated forms being more psycho-toxic than less potent forms. Of great concern when it comes to teens, HPC comes in very appealing forms (baked goods, candy, and drinks). Full article here.
“Woody Harrelson quit; What happens to your body after a stoner quits smoking weed.”
Expect the following if you child attempts to quit or quits marijuana, and give them lots of love and support! Dr. Stuart Gitlow and Dr. Joseph Garbely explain what happens to them. Read the full article here.
- They miss and crave it at first
- They get anxious
- They feel feelings again
- It’s going to be uncomfortable for months, even a year
Marijuana Use Linked with Poor Depression Recovery
Journal of Affective Disorders; ePub 2017 Feb 13; Bahorik, et al
Marijuana use is common and associated with poor recovery among psychiatry outpatients with depression a recent study found. Researchers evaluated 307 psychiatry outpatients with depression, and past-month marijuana use for a substance use intervention trial. They found:
- Marijuana use worsened depression and anxiety symptoms; it also led to poorer mental health functioning.
- Medical marijuana (26.8%; n=33) was associated with poorer physical health functioning.
Keeping Teenagers Safe In Vehicles: Alcohol use is down but marijuana use is up
O’Malley, P. & Johnson, American Journal of Public Health. Nov. 2013, Vol 103, No. 11.
Driving accidents remain the number one cause of mortality among American teenagers. Alcohol use is often involved, and more recently, distracted driving as a result of cell phones is a contributor. A recent analysis has found that drinking and driving has decreased among teenagers, but “using marijuana and driving has increased.” In this longitudinal study, a sample of 22,000 12th grade students from high schools across the country were questioned over a ten-year period, from 2001-2011. They showed an increase over the 10-year period in either being the driver or passenger of a driver who had just used marijuana. Specifically, 28% reported doing so within the past two weeks. Marijuana use can impact drivers as much as alcohol.
Early Marijuana Use Heightens Psychosis Risk in Young Adults (summary)
John McGrath MD, Rosa Alati MD Archives of General Psychiatry, published online March 1, 2010,
MedscapeCME: Psychiatry and Mental Health
“Early cannabis use increases the risk of psychosis in young adults,” reports lead investigator John McGrath, MD, of Queensland Centre for Mental Health Research in Brisbane, Australia. “Apart from having an increased risk of having a disorder like schizophrenia, the longer the young adults reported since their first cannabis use, the more likely they were to report isolated symptoms of psychosis.”
Investigators assessed 3801 study participants at ages 18-23 years, identifying first marijuana use and three psychosis-related outcomes: non-affective disease, hallucinations, and the Peters et al Delusions Inventory Score. “Psychotic disorders are common and typically affect 1 or 2 people of every 100” Dr. McGrath said, “…(I) was surprised that the results were so strong and so consistent… We need to think about prevention.”
Results mirror those of another study conducted by Michael Compton MD, published in the American Journal of Psychiatry (November 2009), where investigators looked at 109 patients in a psychiatric unit and found that daily marijuana and tobacco use was common. Of those who abused cannabis, almost 88% were classified as weekly or daily users before the onset of psychosis.
Emma Barkus, PhD, from the University of Wollongong in New South Wales, Australia, says other studies suggest that those who are engaging in risk behaviors about the age of 14 years are more likely to persist as they get older, adding further support to the role of cannabis use in predicting earlier psychoses.
Evidence Accumulates for Links Between Marijuana and Psychosis (summary)
Michael T. Compton, MD, MPH – Assistant Professor, Emory University School of Medicine, Department of Psychiatry and Behavioral Sciences, Atlanta, Georgia, 2008
Cannabis is the most abused illicit substance in the general US population, and the most abused illegal drug among individuals with schizophrenia.This literature reviewed studies that examined (1) associations between cannabis use and clinical manifestations of psychosis, and (2) the biologic plausibility of the observed links.
The initiation of cannabis use among those with psychotic disorders often precedes the onset of psychosis by several years.Cannabis use in adolescence is increasingly recognized as an independent risk factor for psychosis and schizophrenia. Progression to daily cannabis use was associated with age at onset.
Study evidence also supported biological links between cannabis use and psychosis. In the brains of heavy users, interactions with specific cannabinoid receptors are distributed in brain regions implicated in schizophrenia. Other studies report elevated levels of endogenous cannabinoids in the blood and cerebrospinal fluid of patients with schizophrenia. When THC (tetrahydrocannabinol) was administered in one trial, it caused both patients and controls to experience transient increases in cognitive impairments and schizophrenia-like positive and negative symptoms.
Chronic toxicology of cannabis. (summary)
Reece, Albert Stuart; Clinical Toxicology (Philadelphia, PA.) vol. 47 issue 6, Jul 2009 . Medical School, University of Queensland, Highgate Hill, Brisbane, QLD, Australia.
Findings: There is evidence of psychiatric, respiratory, cardiovascular, and bone toxicity associated with chronic cannabis use. Cannabis is implicated:
- In major long-term psychiatric conditions including depression, anxiety, psychosis, bipolar disorder;
- Respiratory conditions include reduced lung density, lung cysts, and chronic bronchitis;
- elevated rates of myocardial infarction and cardiac arrythmias;
- linked to cancers at eight sites, including children after in utero maternal exposure.
Marijuana Use, Withdrawal, and Craving in Adolescents (summary)
Kevin M. Gray, MD, Assistant Professor in the youth division of the Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina in Charleston.
Findings in the literature survey: Initiation of marijuana use typically occurs during adolescence. Recent data indicate that in the United States, 42% of high school seniors have tried marijuana; 18% have used it in the past 30 days; and 5% use it daily. Among adolescents aged 12 to 17, 3.6% met criteria for cannabis use disorder (abuse or dependence) and 2% met criteria for cannabis dependence.
More than half (51%) of adolescents reported that marijuana is fairly or very easy to obtain. Ironically, this ready availability may be a “reverse gateway” from marijuana use to cigarette use to nicotine dependence. Earlier initiation is associated with problem-related marijuana use: “hard” drug use, poly-drug use, and academic failure. Using marijuana once per week or more during adolescence is associated with a 7-fold increase in the rate of daily marijuana use in young adulthood. Cannabis dependence increases the risk factors for impaired driving and delinquent behavior. Chronic use is associated with impaired immune function, respiratory illnesses, cognitive problems, and motivational impairment.
There is a debate whether marijuana use begins as “self-medication” for psychiatric disorders, or whether habitual marijuana use can predispose some individuals to psychiatric symptoms.
Social anxiety disorder in adolescence is associated with 6.5-times greater odds of subsequent cannabis dependence, and vice versa, frequent marijuana use during adolescence appears to increase the risk of subsequent development of anxiety and depressive disorders. The prevalence of cannabis abuse is 2 to 3 times greater among adolescents who have major depression. Also linked in both directions: conduct disorder predicts marijuana and other substance use, while early-onset marijuana use predicts conduct disorder.
Five treatment regimes were studied: motivational enhancement/cognitive-behavioral therapy (MET/CBT), family education and therapy intervention, a community reinforcement approach, and multidimensional family therapy. All resulted in positive but modest outcomes, with MET/CBT and community reinforcement treatments being most cost-effective.
Emerging evidence indicates rewards for marijuana abstinence may be positive. Multi-systemic therapy, an intensive approach that incorporates individual, family, and community components, has demonstrated effectiveness among delinquent adolescents.
Withdrawal: Marijuana withdrawal symptoms are a constellation of emotional, behavioral, and physical symptoms that include anger and aggression, anxiety, decreased appetite and weight loss, irritability, restlessness, and sleep difficulty, which result specifically from withdrawal of marijuana’s psychoactive ingredient, THC. Less frequent but sometimes present symptoms are depressed mood, stomach pain and physical discomfort, shakiness, and sweating. Onset of withdrawal symptoms typically occurs within 24 hours of cessation of THC, and symptoms may last days to approximately 1 to 2 weeks.
Craving: Patients’ craving of marijuana is evidenced after presenting them with cues associated with marijuana (e.g. sight or smell of the substance, films of drug-taking locations, and drug-related paraphernalia). Exposure to cues leads to robust increases in craving, along with modest increases in perspiration and heart rate. Cue reactivity can predict drug relapse.
Craving and withdrawal symptoms interfere with successful cessation of use and sustained abstinence. In addition, medications are often used to target withdrawal from substances, such as benzodiazepines for alcohol dependence and clonidine and buprenorphine for opioid dependence. These medications could be combined with psychosocial interventions, or developed to complement concurrent psychosocial treatments.
Legalization of Marijuana: Potential Impact on Youth (summary)
Alain Joffe, MD, MPH, W. Samuel Yancy, MD the Committee on Substance Abuse and Committee on Adolescence – PEDIATRICS Vol. 113 No. 6 June 2004, pp. e632-e638
Scientists have demonstrated that the emotional stress caused by withdrawal from marijuana is linked to the same brain chemical that has been linked to anxiety and stress during opiate, alcohol, and cocaine withdrawal. THC stimulates the same neurochemical process that reinforces dependence on other addictive drugs. Current, well known, scientific information about marijuana shows the cognitive, behavioral,and somatic consequences of acute and long-term use, which include negative effects on short-term memory, concentration, attention span, motivation, and problem solving. These clearly interfere with learning, and have adverse effects on coordination, judgment, reaction time, and tracking ability. http://pediatrics.aappublications.org/cgi/content/full/113/6/e632
The Past, Present, and Future of Medical Marijuana in the United States (summary)
By John Thomas, JD, LLM, MPH, Professor of advanced law and medicine, civil procedure, and commercial law at the Quinnipiac University College of Law, Hamdon, Connecticut, January 6, 2010
Cannabidiol (CBD) is considered safe and has a variety of positive benefits, and this component should be legalized. However, the other narcotic component in marijuana, tetrahydrocannabinol (THC), is responsible for the high, and too much may not be a good thing because it can produce psychotic symptoms in people.
Ronald Pies, MD, Editor in Chief – Psychiatric Times. Vol. 27 No. 2 , January 6, 2010
Link Between Cannabis Use and Psychosis Onset at a Younger Age (summary)
Ana Gonzales MD, Santiago Apostol Hospital in Vitoria, Spain, Journal of Clinical Psychiatry. August 2008
Fergusson DM, Boden JM, Addiction; Pages: 969-76; Volume(Issue): 103(6), June 2008
A longitudinal study of a New Zealand birth cohort tracked subjects to age 25 years. Cannabis use at from ages 14-25 was measured by: university degree attainment to age 25; income at age 25, welfare dependence during the period 21-25 years, unemployment 21-25 years, relationship quality, and life satisfaction. Other indices were measured to adjust for confounding factors: childhood socio-economic disadvantage, family adversity, childhood and early adolescent behavioral adjustment and cognitive ability, and adolescent and young adult mental health and substance use.The findings were statistically significant. Increasing levels of cannabis use at ages 14-21 resulted in lower levels of degree attainment by age 25, lower income at age 25, higher levels of welfare dependence, higher unemployment, lower levels of relationship satisfaction, and lower levels of life satisfaction.
Doctors: Pot Triggers Psychotic Symptoms (summary)
May 1, 2007 Aetna Intelihealth – Mental Health
LONDON — New findings show physical evidence of the drug’s damaging influence on the human brain. In some people, it triggers temporary psychotic symptoms including hallucinations and paranoid delusions. Two of the active ingredients of cannabis: cannabidiol (CBD) made people more relaxed. But second ingredient: tetrahydrocannabinol (THC) in small doses produced temporary psychotic symptoms in people, including hallucinations and paranoid delusions. According to Dr. Philip McGuire, a professor of psychiatry at King’s College, London, THC interfered with activity in the inferior frontal cortex, a region of the brain associated with paranoia. “THC is switching off (a chemical) regulator,” McGuire said, “effectively unleashing the paranoia usually kept under control by the frontal cortex.”In another study, Dr. Deepak Cyril D’Souza, an associate professor at Yale University School of Medicine, and colleagues tested THC on 150 healthy volunteers and 13 people with stable schizophrenia. Nearly half of the healthy subjects experienced psychotic symptoms when given the drug. Unfortunately, the results for the schizophrenic subjects was so much worse that researchers scrapped adding additional schizophrenic subjects to the study. The negative impact was so pronounced that it would have been unethical to test it on more schizophrenic people.”One of the great puzzles is why people with schizophrenia keep taking the stuff when it makes the paranoia worse,” said Dr. Robin Murray, a professor of psychiatry at King’s College in UK. She theorized that schizophrenics may mistakenly judge the drug’s pleasurable effects as outweighing any negatives.