Research and Studies

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.

Detailed Information
. Patients freely share their “medicine” with family and friends, and parents are self-diagnosing, and subsequently dosing their children with high-concentration marijuana products for conditions that may simply not exist (attention-deficit/hyperactivity disorder, anxiety, etc.); or allow their medical cards to expire and continue to grow their own.
The use of marijuana for medical conditions, including pain, needs robust studies, and subsequent products need more regulation and consistency for public consumption. Colorado is an example of the societal effect across a wide spectrum of arenas that comes with rampant cannabis use, particularly in youth use and impaired driving fatalities. The problems Colorado is seeing completely transcend “responsible use” or “marijuana as medicine.” 

"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."

At the moment, there simply isn’t enough evidence to prove that cannabinoids – whether natural or synthetic – works to treat cancer in patients, although research is ongoing. And there’s certainly no evidence that ‘street’ cannabis can treat cancer.

Given these statistics.... is legalization worth the consequences....
Cannabis has been found to be the most frequently used drug in the U.S. after alcohol, tobacco and caffeine. 
The risk of developing addiction associated with cannabis use has been reported to increase to about 17% among those who start using marijuana in adolescence, and to 25-50% among those who smoke marijuana daily.
The long-term effects of marijuana use include altered brain development and cognitive impairment, including impaired neural connectivity in specific brain regions, decreased activity in prefrontal regions, and reduced volumes in the hippocampus.
Cannabis is most commonly consumed through smoking, a route of drug delivery that predictably has a variety of negative effects on pulmonary function. Smoke from marijuana combustion has been shown to contain a number of carcinogens and cocarcinogens, as well as many of the toxins, irritants, and carcinogens as tobacco smoke.  Additionally, marijuana smokers tend to inhale more deeply and hold their breath longer than cigarette smokers, which leads to a greater exposure per breath to “tar” (the carcinogenic solids in smoke). Regular smoking of marijuana, in the absence of tobacco, produces visible and microscopic injury to the large airways
http://www.asam.org/docs/default-source/publicy-policy-statements/mariju...

There are difficulties in researching the effects of cannabis.

1. Many people who smoke cannabis also smoke tobacco. And users of cannabis often mix it with tobacco. This can make it difficult to know whether it is the tobacco, the cannabis, or both that has caused a cancer.
2. The amount of THC in cannabis also varies. Some of the cannabis available today is much stronger than it was 20 years ago. These versions contain more THC.
3. Another difficulty researchers have is in recruiting people who smoke cannabis into studies. Because cannabis is an illegal drug in many countries, people may be reluctant to take part in research. And if they do agree to take part, they may not say how much cannabis they actually smoke.

Overall, these studies seem to indicate that cannabinoids have a significant role to play in the management of chronic pain. However, there are important issues that limit the validity of this conclusion. First and most important is how the improvement in pain was evaluated. In many of the studies, only instruments to measure the level of pain, most notably the Visual Analogue Scale, were used. This is fine when one is measuring acute pain. But when it comes to chronic pain—which is what the studies were looking at—the most important measures of the impact of any treatment are improvement in functioning and other objective measures, such as reduction in use of analgesic medications.
he review found minimal evidence that cannabinoids are beneficial for the nausea and vomiting associated with chemotherapy or for stimulation of appetite in patients with HIV/AIDS. It also found no evidence of effectiveness for the treatment of glaucoma or mental disorders; instead, it found that cannabinoids were more likely to worsen the latter. There was some evidence that cannabinoids might be beneficial for the spasticity associated with multiple sclerosis, but even here the results did not reach statistical significance. 
Current research has fallen far short of criteria required by the FDA to approve any drug, much less for conditions not considered acutely life-threatening and for which there are already many other effective and safe treatments. The variation from state to state as to which medical conditions are approved for cannabinoid use is not because lawmakers have ignored scientific evidence. Rather, it reflects the absence of such evidence and an approval process based on politics, not science.

Mr. Wright was confident that a new anticancer drug called Krebiozen would cure him. Mr. Wright’s tumors had shrunk by half, and after 10 more days of treatment he was discharged from the hospital. And yet the other patients in the hospital who had received Krebiozen showed no improvement.