20 years of marijuana research shows ill effects of chronic use: review
Josh Elliott, CTVNews.ca
Published Tuesday, October 7, 2014 5:57PM EDT
A 20-year medical review shows regular marijuana use won’t kill you, but it will increase your chances of developing psychotic symptoms or addiction to the drug – especially if you start smoking at a young age.
A review published Monday in the scientific journal Addiction seeks to summarize all that doctors have learned about marijuana in the last 20 years. According to the latest research, marijuana use can impair people’s ability to drive and produce a number of adverse effects in regular users, including addiction and various psychological disorders.
Regular smokers who start using the drug in their teenage years are even more at risk of developing these adverse effects, according to review author Wayne Hall.
Hall, a World Health Organization expert advisor on addiction, reviewed cannabis research since 1993 for his article titled “What has research over the past two decades revealed about the adverse health effects of recreational cannabis use?” Hall’s article defines a regular cannabis user as someone who smokes marijuana nearly every day.
According to the studies Hall reviewed, regular cannabis users face a one-in-10 chance of developing a dependency on the drug. However, that number goes up to one-in-six for users who started smoking regularly in their teenage years.
Hall says cannabis has become more potent over the years as people have turned to cannabis plants with higher levels of THC, the active ingredient in marijuana. Addiction cases have also gone up over that time. “The number of cannabis users seeking help to quit or control their cannabis use has increased during the past two decades,” Hall says in the article.Regular marijuana users increase their chances of developing psychotic symptoms and disorders like schizophrenia, particularly if they have a family history of mental illness, Hall found. Users who start smoking in their adolescence are twice as likely to develop a disorder, he said.
For people already at risk of developing psychosis, marijuana can bring those symptoms on sooner, Hall found. The drug essentially makes it easier for psychosis to come to the surface in people who show a tendency toward it.
Hall’s review also found teenagers who use marijuana regularly are more likely to develop an intellectual impairment. Hall says according to a number of studies, regular teenaged marijuana users fare worse in school than their non-using peers. “Studies showed that the earlier the age of first cannabis use, the lower the chances of completing school and undertaking post-secondary training,” Hall’s review said.
Hall also concludes that regular cannabis use causes a person’s IQ to drop over time. “The decline in IQ was largest in those who began using cannabis in adolescence and continued near-daily use through adulthood,” he said
Hall says there is almost no chance of someone dying from a marijuana overdose, since even a very heavy user cannot take in enough THC to reach lethal levels.
However, marijuana can still be deadly if a user gets behind the wheel of a car.
Hall says marijuana impairs reaction time, hand-eye coordination and cognitive abilities, making it difficult for a driver to judge and react to situations quickly. “Cannabis users who drive while intoxicated approximately double their risk of a car crash,” Hall said.
That risk is even higher when marijuana is combined with alcohol.
Babies whose mothers smoked marijuana while pregnant showed a number of adverse effects, according to the studies in Hall’s review.
Hall says babies born to pot-smoking mothers often have a slightly below-normal birth weight, and tend to be more easily startled. Their eyesight develops slower than it does for other babies, and later in life, they are more likely to show “delinquency and problem behaviour,” he said.
By grade school, children of marijuana-smoking mothers often fare poorly in reading and spelling tests, Hall’s review found
Hall’s review of cannabis research turned up a number of other long-term health issues linked to the drug, including lung cancer, cardiovascular disease and increased risk of heart attack. “The cardiovascular risks of cannabis smoking are probably highest in older adults, but younger adults with undiagnosed cardiovascular disease may also be at risk,” Hall said.
However, Hall says it’s tougher to link marijuana to lung cancer because many marijuana smokers also smoke tobacco, which is known to cause lung cancer.
Hall says marijuana is the third-most common drug addiction in Canada, behind only alcohol and tobacco. He estimates between one and two per cent of adults per year will be affected by marijuana addiction, and up to eight per cent of adults will deal with marijuana dependency in their lifetime.
If that actually happened the CAF would be in the hurt locker. Anecdotal evidence only mind you.Brihard said:MAke the troops piss more often, and fire those who fail pour encouragez les autres.
Sheep Dog AT said:If that actually happened the CAF would be in the hurt locker. Anecdotal evidence only mind you.
Brihard said:Would it be embarrassing? Absolutely. But in the long term it would be to our benefit to increase the deterrence of drug use, as well as to 'catch' more guys and get them into treatment before their drug use becomes worse. If hitting more guys with piss tests has a down-the-road impact on reducing CF members who catch criminal charges for substance related idiocy like driving high or getting coked up and committing an assault, I'm all for it.
Hatchet Man said:A good place to start is early, ie in the recruiting/basic training phase. Why we don't piss test applicants is beyond me. I mean most assume we do already, it's actually more of a surprise to them when they find out we don't.
Sheep Dog AT said:I'd love to see drug dogs down the hallways of the shacks and in suspicious PMQ's, however I think if every member convicted of a drug charge were released we'd have a skeleton crew on many bases.
DAA said:PS - and the dead give aways when they do get called in for whatever the reason..........
1. I'm a bit worried. You see, I was at a party/concert this past weekend and there were people around me smoking up. I didn't but I probably inhaled some second hand smoke..... :facepalm:
2. I'm a bit worried. You see, I eat ALOT of poppy sead bagels from Tim Hortons and I heard that this can result in a false positive result and I don't want that on my records.... :facepalm:
3. I'm a bit worried. You see, I've been taking medication X and I heard that this can result in a false positive result...... :facepalm:
If prior to providing the sample, they start coming up with reasons why it could be a "positive", then the writing is on the wall.
ModlrMike said:Trafficking on the other hand needs to be vigorously and ruthlessly punished so as to serve as an example to others.
Everyone entering a military base consents to search and seizure. Surely, that applies to CF members as well.KevinB said:Run dog training in the Shacks for training.
Dog get a hit - then you have PC for a Warrant.
You can run hygiene inspections in the barracks, why not dog's.
The CF owns the barracks - they can do whatever the frig they want to in them --if someone wants to cry - then make a condition of living on base...
I highly doubt the CoR&F was designed to allow druggies a safe haven in government service (well actually on reflection PET was a bit of a pot head...)
We piss test all our employees - we also invite the local LE, SO, and State Troopers to use our facility for K9 practice (we are a DOD facility so we can search as well without warrant).
Tcm621 said:Everyone entering a military base consents to search and seizure. Surely, that applies to CF members as well.
My biggest concern would be if pot was legalized but stayed illegal in the forces. Could you be charged if you spouse had pot in your PMQ? It would be shitty if you could but if not, then people could just claim those plants are my wife's.
If pot becomes legal, I think the only way to handle it would be based on impairment. And there should be some mechanism which would empower the CoC to march a suspected user straight to the pee test if they believe they smoked up before work.
Now in the interests of full disclosure, I have gone to work still drunk from the night before, so that is a little hypocritical.
Brasidas said:I know chronic users who never smoke up before work. They do it every evening, as part of their social routine, and leave it at that. They would fail a pee test, as THC is always in their system.
To the best of my knowledge, such a person may drive and operate machinery safely and without impairment. Screening will show them as positive for THC. To be certain that its not impairing them, you'd need to forbid the use of MJ regardless of whether it is legal for most of the population.
Did I make any mistakes in there?
Hatchet Man said:Really.....so of course you would have zero issue letting them drive you (or your kids if you have any) around?
Brasidas said:No issue whatsoever.
There's a difference between a pot user who wakes up and smokes and a pot user who will do so in the company of their friends in a relaxed setting.
True. But if that user shows signs of impairment, then the drug test would only be a confirmation. And I know a hell of a lot of people who will smoke a joint in situations where they would never, ever drink. Like before work, while driving, etc. Among a growing population, pot is seen as perfectly fine to use at anytime.Brasidas said:No issue whatsoever.
There's a difference between a pot user who wakes up and smokes and a pot user who will do so in the company of their friends in a relaxed setting.