Research and Studies

To look for longer-term effects of cannabis, the experimenters called the subjects back a week later and tested them again on the word lists, this time with a few different dummy words thrown in. They also re-interviewed the subjects about the VR scenarios using a combination of old and new questions. As before, they found lower memory accuracy in the word-association test in those who had been intoxicated compared with sober participants. There were no statistically significant differences between the groups for the virtual reality scenarios, a result that Kloft says may indicate memory decay over time in all participants.

Conclusions and Relevance  This meta-analysis found a significant increase in the odds of past or current and subsequent marijuana use in adolescents and young adults who used e-cigarettes. These findings highlight the importance of addressing the rapid increases in e-cigarette use among youths as a means to help limit marijuana use in this population.

We found that among young recreational cannabis users, a regular dose of cannabis had no effect on simple and learned tasks, but its use led to significant impairments on complex and novel driving-related tasks, as well as perceived driving ability and safety, for up to 5 hours after use. The present finding that the first 5 hours after cannabis use affected driving-related performance substantiates the recommendations of Canada’s Lower-Risk Cannabis Use Guidelines, which recommend waiting 6 hours after cannabis use before driving.30
 

Many novel psychoactive substances (NPS) have entered the recreational drug scene in recent years, yet the problems they cause are similar to those found with established drugs. This article will debate the psychobiological effects of these newer and more traditional substances. It will show how they disrupt the same core psychobiological functions, so damaging well-being in similar ways.

bstract

Although recent Cannabis use is widely reported to be associated with drug-related traffic accidents, the evidence that Cannabis users show an increased risk of being involved in road crashes is still not unequivocally proved. The purpose of the present work is to provide an objective assessment of this hypothesis, by comparing the frequency of occurrence of positive urine analyses in drivers involved in traffic accidents (n = 1406) with that observed in a control population undergoing mandatory urine drug testing (n = 1953). Urine analyses for drugs of abuse were performed by screening immunometric techniques followed by confirmation with UHPLC-QQQ MS, adopting a cut-off concentration for THC-COOH of 15 ng/mL. A case was classified as "positive" when a driver admitted to hospital for road traffic injuries showed urine concentrations of THC-COOH higher than the cut-off. All samples showing positive results for any other controlled drug in urine or blood alcohol concentrations >0.5 mg/mL were excluded from the study. Subjects positive to THC-COOH, and negative to all the other tested substances were 116 in Group 1 (8.2%) and 16 in Group 2 (0.8%). Subjects resulting negative to any tested substances were 1290 in Group 1 and 1937 in Group 2. The frequency of THC-COOH detection in the two groups was compared by using the "chi square" test, which resulted = 119.57, i.e. highly significant (P <<< 0.01). The Odds Ratio of the two groups was =10.88, showing a high degree of association between the presence of THC-COOH in urine and the occurrence of traffic accidents (P < 0.0001). The presented data, proving a high degree of association between Cannabis use and the occurrence of traffic accidents with injuries of the driver, support the use of urine testing for Cannabis in the procedures for the issuing of the driving licence, particularly in the case of subjects formerly or presently using Cannabis. This finding looks even more relevant in the present times, because of the increasing success of the policies of legalization of Cannabis for medical and non-medical purposes.

Findings suggest that marijuana use is associated with a 54% increase in the odds PDV (physical dating violence) victimization, and a 45% increase in the odds of perpetration. CONCLUSIONS: Findings suggest that dating violence is a correlate of marijuana use, and that association is strongest among adolescents (vs. emerging adults) and girls (vs. boys).

The mold and bacteria was so widespread and potentially dangerous that the UC Davis academics concluded that they cannot recommend smoking raw or dried weed. "We cannot recommend inhaling it," says George Thompson III, an associate professor of clinical medicine at the university who helped conduct the cannabis research.

“But the bottom line is that long-term, heavy cannabis use may impair the dopaminergic system, which could have a variety of negative effects on learning and behavior,” said Dr. Anissa Abi-Dargham, professor of psychiatry and a lead author of the paper.
 
“I used to be able to read a book and even after a couple years I would still know most of the book,” she said. “Now I have to read something four or five times to remember.”

"This development of stress cardiomyopathy in younger patients who used marijuana suggests a possible link that needs to be further investigated," said Sahil Agrawal, M.D., co-author of the paper and also a chief cardiology fellow at St. Luke's.

Marijuana users were more likely than non-users to have a history of depression (32.9 percent vs. 14.5 percent), psychosis (11.9 percent vs. 3.8 percent), anxiety disorder (28.4 percent vs. 16.2 percent), alcoholism (13.3 percent vs. 2.8 percent), tobacco use (73.3 percent vs. 28.6 percent) and multiple substance abuse (11.4 percent vs. 0.3 percent). Because some of these can increase the risk of stress cardiomyopathy, the researchers adjusted for known risk factors to investigate the association between marijuana use and stress cardiomyopathy.

The children presented typical signs of intoxication by Δ9-THC (inappropriate laughter, ataxia, reduced attention, and eye redness) after using a CBD-enriched extract. The extract was replaced by the same dose of purified CBD with no Δ9-THC in both cases, which led to improvement in intoxication signs and seizure remission. 

30 Referenced Resources

“In this observational study,” it found that “initiating marijuana use after treatment was associated with worse PTSD symptoms, more violent behavior, and alcohol use. Marijuana may actually worsen PTSD symptoms or nullify the benefits of specialized, intensive treatment. Cessation or prevention of use may be an important goal of treatment.”

In summary, marijuana use is harmful to children and adolescents.  For this reason, the American College of Pediatricians opposes its legalization for recreational use and urges extreme caution in legalizing it for medicinal use.  Likewise, the American Academy of Child and Adolescent Psychiatry (AACAP) recently offered their own policy statement opposing efforts to legalize marijuana. They similarly pointed out that “marijuana’s deleterious effects on adolescent brain development, cognition, and social functioning may have immediate and long-term implications, including increased risk of motor vehicle accidents, sexual victimization, academic failure, lasting decline in intelligence measures, psychopathology, addiction, and psychosocial and occupational impairment.” Thus the AACAP (a) opposes efforts to legalize marijuana, (b) supports initiatives to increase awareness of marijuana’s harmful effects on adolescents, (c) supports improved access to evidence-based treatment, rather than emphasis on criminal charges, for adolescents with cannabis use disorder, and (d) supports careful monitoring of the effects of marijuana-related policy changes on child and adolescent mental health.⁴⁹ The College agrees with this position on marijuana.

• Rates of cannabis use are approximately 2 times greater in persons with psychosis
• Cannabis has negative effects on cognition that are qualitatively similar in the general population, in people with psychotic disorders and in people at risk for psychotic disorders
• Adolescence is an important but vulnerable period of development for both the general population and especially for individuals at high risk for psychotic disorders

Our data indicate that persistent cannabis users constitute a burden on families, communities, and national social-welfare systems. Moreover, heavy cannabis use and dependence was not associated with fewer harmful economic and social problems than was alcohol dependence. Our study underscores the need for prevention and early treatment of individuals dependent on cannabis. 

Although studies are beginning to show that some ingredients in marijuana are likely to be helpful for people with certain conditions, the findings have yet to nail down the specifics about the dose, the frequency, the best form to take (such as getting the active compounds from edible products or smoking it), the risks from frequent use, and whether marijuana works as well as or better than other available treatments, Budney said.
Usage Doubles & Addiction Doubles:  Over this 12-year period, the estimated number of U.S. adults who had used marijuana in the previous 12 months grew from 4.1 percent in 2001 to 9.5 percent in 2013. Marijuana-use disorders, which include problems with drug addiction and dependence, also rose, increasing from 1.5 percent of the adult population in 2001 to 2.9 percent in 2013, the study showed.
 
 College students smoke more pot than cigarettes: The survey found that 5.9 percent of college students said they had smoked pot 20 or more times in the past month. For comparison, 5.2 percent of students reported they had smoked cigarettes 20 or more times in the past month, according to the study. 
Inaccurate Labeling Edibles: Only 13 of the 75 tested pot food products — such as baked goods, beverages and candy — bought from dispensaries in California and Washington state had labels that accurately listed the amount of tetrahydrocannabinol, or THC, 
Teen Brain:  The researchers found that teens who had smoked marijuana — even once — had smaller brain volume in the amygdala compared with teens who never tried pot.
 

"We found that frequent use of high-potency cannabis significantly affects the structure of white matter fibres in the brain, whether you have psychosis or not," 
The main psychoactive ingredient in weed, tetrahydrocannabinol (THC), is much more concentrated in modern skunk strains as compared to traditional pot and hash -- up 14 percent as compared to 4 percent.

More Positive Results With Cannabidiol in Epilepsy (You will need to google this title in order to get the article to avoid creating an account)
They found a reduction of the total number of seizures by a median of 38% at 3 months and 31% at 6 months.
These patients started on a cannabidiol (CBD) dose of 2 mg/kg per day, which was increased to a maximum tolerated dose or to 25 mg/kg per day.
Of the 25 patients enrolled in the study, two discontinued treatment before 6 months. One boy stopped medication after a few months because of intolerable diarrhea, and another patient discontinued the drug because of persistent nausea/vomiting. One patient didn't report 6-month data at the time of the analysis.
More than three quarters (77%) of the 22 remaining patients experienced fewer seizures after 6 months.
However, he stressed that the study was uncontrolled, symptoms were self-reported by families, and there has been a lot of news coverage of medical marijuana for the treatment of epilepsy. "Many parents had been avidly desirous of their child going on this cannabidiol because of what they had read in the lay press, so they were primed to believe this cannabidiol might be beneficial." On the other hand, he said, it's important to keep in mind that these children have "horrible epilepsy" and most have been on more than 10 medications for seizure without success. "Any improvement to that degree in this population that is sustained is a pretty dramatic response."