Research Says Smoking Pot Lowers Your IQ For Good

Submitted by: fancylad 5 years ago in

Party"s over, stoners.
There are 105 comments:
Male 707
Isn`t this old news? thought it was confirmed years ago that still-developing brains can get jacked to a certain degree after smoking extensive amounts of pot.

Anyway, weed is awesome. but it have to be used with caution like any other drug.
If you, for some reason, still are against marijuana in 2012 and think it`s the devils drug, go drat yourself. You`re a dummy.
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Male 2,424
That sounds depressing, good thing I don`t understand it.
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Male 81
In other news. Pot makes people more peaceful, docile, lovable, huggable, and sexsay. Win.
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Male 2,357
@patchgrabber: Couldn`t have said it better myself.

I would like to point out our most recent debate.
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Male 5,811
@HA: But, in the interest of maintaining
rivalry...
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Male 5,811
@HA: I think as long as we stick to non-economic related issues we`d get along swimmingly. I think it`s partially because you`re intelligent and logical, and also because your brand of arrogant smuggery rivals my own. ;-)
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Female 2,525
Too many big words.
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Male 10,855
@HumanAction

Shouldn`t be surprised, we libertarians are after all socially liberal.
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Male 2,357
@patchgrabber: Wow - we agree on something for once. I feel like something must be done to break the uneasiness of our unlikely alliance:

[quote]government-granted monopoly on production of medical marijuana[/quote]
Hehe.
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Male 5,811
@HA: Well I take science seriously. Even though I`m still skeptical about this posts study, I`ll accept it until i see solid evidence to refute it. (even though I don`t care much for the results)
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Male 2,357
@patchgrabber: Interesting - thanks for the link. I just took a moment to search for research on the PubMed.gov database and there seems to be several pilot studies reinforcing your claim.
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Male 40
I started smoking when I was 20 so I guess I`m alright :D
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Male 5,811
@HA: Here`s one study. They only looked at CO concentrations, not polycyclic aromatic hydrocarbons and oxidant gases, but they also said that "the observation of little or no CO exposure suggests little or no exposure to these other compounds."
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Male 2,357
@patchgrabber: [quote]However substitution of vapourizers like I said removes even lung damage from potential negatives.[/quote]
Agreed - at least in the sense that the potential negatives of smoke inhalation would be negated. I haven`t done any research into vaporizers so I don`t have the knowledge necessary for reasonable input.

I would love to see the results of that study though; like I said before, I`m confident that the negative effects of marijuana are less than alcohol or tobacco.
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Male 5,811
@HA: Ok then. However substitution of vapourizers like I said removes even lung damage from potential negatives.
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Male 2,357
@patchgrabber: [quote]Now there is possibly some bronchial damage from the smoking itself[/quote]
This is what I was saying...
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Male 2,357
@patchgrabber: [quote]And yet a study funded by the NIDA found that marijuana smoking doesn`t cause lung cancer, and there are studies that suggest that it fights cancer.[/quote]
I didn`t say cancer - I said lung damage. I also clearly stated that ALL prolonged smoke inhalation carries and increased risk of causing lung damage.
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Male 5,811
Here`s the actual study.
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Male 5,811
@HA: And yet a study funded by the NIDA found that marijuana smoking doesn`t cause lung cancer, and there are studies that suggest that it fights cancer. Now there is possibly some bronchial damage from the smoking itself, but substitute a vapourizer and that problem is gone, but the NIDA won`t fund vapourizer studies, coincidentally. ;-)
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Male 5,811
@HA: The NIDA has publicly admitted that they do not fund or support any study concerned with the positive aspects of marijuana use. Shirley Simson, a spokeswoman for NIDA, said “As the National Institute on Drug Abuse, our focus is primarily on the negative consequences of marijuana use. We generally do not fund research focused on the potential medical effects of marijuana.”

Since the NIDA has a government-granted monopoly on production of medical marijuana for research purposes. So they have an anti-weed agenda and are the gatekeepers for marijuana research in the US. Not a very credible organization.
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Male 2,357
@SarahofBorg:

[quote">Many researchers agree that marijuana smoke contains known carcinogens, or chemicals that can cause cancer much like those in tobacco smoke[/quote">
Cancer.org

Like I said before, ALL instances of prolonged smoke inhalation carries a heightened risk of causing lung damage - ask a doctor.
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Male 10,855
[quote] Sorry guys, but the fact is, it`s a carcinogen with negative psychological effects[/quote]

It`s nothing compared to the negative social effects enforcing its prohibition has.
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Female 3,562
Human Action, there is absolutely no evidence that smoking weed causes lung problems of any kind. There have, however, been studies showing your risk of lung cancer is reduced if you smoke weed. I don`t have the links right now but they are out there. Also, weed is absolutely full of anti-oxidants, which explains it`s preventive powers.
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Female 3,562
Know what else can screw up your IQ if you start using it regularly as a teenager? Alcohol. And for that matter, how do we know all the kinds on ritalin aren`t going to be screwed up for life?
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Male 1,871
I think I`ll just light up a fatty and forget about this.......
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Female 373
Smoking dope makes you stupid? They had to really test for that, ohh science get a hobby.
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Male 2,357
"`Numerous studies have shown marijuana smoke to contain carcinogens and to be an irritant to the lungs. In fact, marijuana smoke contains 50-70 percent more carcinogenic hydrocarbons than tobacco smoke. Marijuana users usually inhale more deeply and hold their breath longer than tobacco smokers do, which further increase the lungs` exposure to carcinogenic smoke."

Source

I think it would be naive to assume that SMOKING marijuana has zero negative health effects. Repetitive inhalation of any smoke (even campfire) adversely affects the lungs. That being said, I don`t think marijuana is any more dangerous than tobacco or alcohol.

My libertarian sense also says that it`s none of the governments business what I choose to do with my body as long as it does not strip another of their civil liberties.
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Male 244
as far as our fed govt is concerned herione is way better for you anyways
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Male 566
As a 1-3gm daily smoker for the last 35 years, am I less intelligent, doubtful. Is my memory effected, yes. Would i trade the enjoyment I`ve derived from it for a few IQ points, never!
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Male 559
1 in 20 people admitted to smoking pot before age 18 in a study of over 1000 people. Does that mean that only 50 people out of the 1000 actually showed the results they are alluding to?

The sample size of this study if far too low to give any meaningful results.

Here is a study that says it increases neurogenesis by as much as 40% in the hippocampus.

Link to study
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Male 39,958

CrakrJak, [quote]"Gotta love the lame and often misspelled and grammatically incorrect responses to this study from the pot smokers here at IAB.

By their accounts it`s a miracle drug good for everything that ails you. Sorry guys, but the fact is, it`s a carcinogen with negative psychological effects."[/quote]
First, "Gotta" isn`t a propper work. I know it`s in the online dictionaries, but stil. . . .

Second, pot isn`t a carcinogen. The paper you roll it in is :-) Accuracy counts!
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Male 5,811
After reviewing the study, I find some interesting anomalies, namely the standard error bars on their results are quite large. I don`t know what kind of statistical magic they used to obtain significant results, but I`ll believe them for now until another study with better results comes along to support/refute them.
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Male 5,811
Here`s the study, but I`m not sure if everyone can read it since I have many journal licenses, so I hope you all can read it.

Crakr: "...but the fact is, it`s a carcinogen..."

Keep telling yourself that.
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Male 4,242
gun shoots to the head Lowers Your IQ For Good
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Male 4,242
ageing Lowers Your IQ For Good
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Male 5,811
Well, the attention/memory can be dismissed, because it`s just the opinion of close family members. But it is interesting that it could affect the brain while it`s still growing. I guess this is part of the reason why we don`t make it legal for teenagers to drink alcohol either...
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Male 14,331
Alcohol kills brain cells also.
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Male 5,189
Moderation.

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Male 7,123
Apparently over-18 `college smokers` don`t have this problem. They may not perform as well while smoking heavily but there is no indication of damage once the brain is fully formed.
So a 13 year old who smokes as much as I did when I was 25 (not huge, but regular)is going to do some serious damage. Probably not as much as if we substituted the word `drinks` for `smokes`.

It seems common sense that we apply the same rules to weed as we do to booze and baccy. Age restrictions, quality control,licensed outlets, driving restrictions, health education etc.
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Male 406
i agree.
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Male 8
New Guy for president!
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Male 406
Cool! Now we know drugs are bad lets address alcohol and all the legal drugs that get sold in shops all over the world... Or let`s legalize it all and get a government policy and stop the enormous black market that profits from this and supply`s funds to organized crimes and gangs not to mention decriminalize the drug uses. Get them clean drugs and ultimately the help they need? No?
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Male 7,123
Gerry,
They did. The methodology seems to be impeccable.
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Male 19
You guys should actually read the article. It says "teenagers." ANY kind of drug will hurt a developing brain. There is still no evidence whatsoever that pot does anything negative to your brain if you start smoking as an adult.
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Male 17,511
Gotta love the lame and often misspelled and grammatically incorrect responses to this study from the pot smokers here at IAB.

By their accounts it`s a miracle drug good for everything that ails you. Sorry guys, but the fact is, it`s a carcinogen with negative psychological effects.
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Male 8
@CoyoteKing and many others:

It`s sad to see so many people critiquing this study as if they know better how to do scientific research than a team of professors and researchers who spent a good portion of their lives learning how to gather unbiased and statistically correct data. This study is being published in PNAS, a respected journal. Like all studies published in PNAS, it`s methodology has succesfully passed independent peer review.

If you`re going to spew your opinions about things you don`t know alot about and act as if they`re facts then you`re going to look like an idiot to anyone who does know how it works.
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Male 2,332
I`ll smoke to that
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Male 7,123
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Male 39,958

How do they know it isn`t just naturally stupid kids use marijuana?
They need to test them before pot use, then after.
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Male 6,737
@carmium - Indeed.
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Male 2,988
@elkingo: "For testing, however, we (psychological researchers) use the actual score provided by the tests."

I really hope you psychological researchers are using more data points to produces your published results than 5 data points (year 18, 21, 26, 32, 38) for 50 samples.

face it. there is not enough data hear to prove its right, whether or not it really is true, the research scope of work is too narrow minded to provide the claim that its making. those that started the research just didn`t plain enough ahead.
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Male 2,988
@elkingo: you seem to not be able to grasp statistical data for research. a sample size of 50 is incredibly small, given the scope of the experiment. what you fail to grasp here is the variables. in a study like this where there are so many variables (in the way they were able to lead there own lives and be influenced by other means like alcohol, other "harder" drugs, social status, income bracket, culture, and others. you quickly realize that only 50 people is very small.

as far as providing an "exact" number only means that thats what their data said, only a fool would not give a number based off measurement without a margin of error. its the basis of all scientific data. and the method of standard deviation is the basis for all statistical data when the data is used to "try" to show a trend of correlation

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Female 6,381
I kinda think anything with a degree of toxicity, including tobacco and alcohol, would slowly erode your IQ if you took enough of it.
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Male 503
Fortunately, I seem to be an exception to this study. I have smoked, eaten, and vaporized cannabis since I was twelve years of age. My tri annual intelligence quotient test, which is administered to me even into my adult years by a friend who is a college professor has only varied slightly since second grade, and always has the deviation been upwards.
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Male 5,620
@CoyoteKing:
"a quick search on IQ tests and you can find that the reliability of IQ tests has about 3 point standard deviation"

This is misleading. They also provide an "exact" number. We use a 3 point range +/- for reports because it is a more conservative and safe model.

For testing, however, we (psychological researchers) use the actual score provided by the tests.

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Male 5,620
@CoyoteKing 1000 total participants with 50 subjects in any one group can hold more power than you can imagine. Considering it was a repeated study (being within subjects) it lends more power to the actual study. However, 50 for a preliminary study is a large number. I would think that this is the first study of this nature as well.
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Male 5,620
@Ajikan: Yea, I would assume so too. I`d like to read the actual article for this study. I wonder when it will hit archives.
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Male 5,620
@DrProfessor: IQ tests are not evaluations of academic performance.
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Male 1,526
I only assume they follow the standard practice of giving age appropriate tests. Different tests are used for children than adults.
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Male 5,620
jops360 -- control isn`t necessary for IQ tests -- considering the efforts to validate the tests themselves. These sorts of tests on reliability and validity have been repeated heavily. We already know the "norm".
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Male 5,620
@ledzeppeloyd

It dropped IQ 8 points, that is nearly 1 standard deviation. Which may not sound impressive, but truly is a remarkable finding. Granted, the difference in the mid range isn`t that much, per se.. on the extremes it is quite a lot.

For example, if the base IQ was say, 83 -- loosing 8 points gives them MMR.
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Male 5,620
@OldOllie it recovers some, but not fully. However, and what is more interesting is this study shows the implications of using cannabis over time.

If you started as a teen, you have permanent cognitive deficits.

If you started in your 20`s, and quit a year before final testing, there was *some* recovery.
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Male 5,620
@Ajikan: "IQ is not scored the same way for kids as it is for adults. Actually the score on young kids get a higher score than the test done on adults."

That statement is simply wrong and misleading.

It really depends on the test, but assuming they probably utilizes the WISC IV for children, and the WAIS IV for adults, the tests themselves have valid and reliable measures (which have been tested, and retested to the extremes) which are good indicators of IQ. The researchers would have definitely utilized appropriate test materials.

source: I am a Clinical Psychology Graduate Student
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Male 1,526
his study has been disproved.
IQ is not scored the same way for kids as it is for adults. Actually the score on young kids get a higher score than the test done on adults. And I seriously doubt any factors are included in this study besides cannabis.
Pure bs.
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Male 2,579
It also prevents pregnancy along with mountain dew!
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Male 2,513
Weed is great, that being said I smoke it too often, that is why I`ve stopped.
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Male 15,832
@madest -- Exactly.

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Male 273
most people over think things anyways. i mean you don`t have to have a high iq to be unemployed or working minimum wage for a corporation, which is what most teenagers these days have to look forward to anyways thanks to capitalism lol
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Male 96
Propaganda.
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Male 7,378
Yeah. Old Ollies a genius like I am an astronaut. 420 peeps!
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Male 2,578
We got lots of pot fans here.
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Male 1,558
I THINK THAT WE SHOULD.. ...WHAT WAS THE QUESTION?
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Male 15,832
If you read the article, it says that if you quit, your IQ recovers. So I guess "permanent" doesn`t quite mean what these geniuses think it means.

BTW. I smoked for years BEFORE I joined TNS and ISPE
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Male 15,271
I can spare 8 points, so no reason not to take up pot smoking.
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Male 2,384
it lowers it 3 whole points.... i mean come on, really, now they`re just grasping at straws
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Male 3,445
`The part I think people keep missing is that this is talking about adolescents, kids in high school.`

Perhaps their reading comprehension has been impaired.
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Male 2,344
are they back to this crap???

there have been tons of other studies that have debunked this crap ages ago.
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Male 49
Is there documentation in this study of alcohol or any other drug use in the 1000 people that were followed? When they say that even after stopping, users that started in their teens do not fully recover intelligence, what does that mean? They were quick to say you can lose 8 IQ points - if you quit do you gain back 1? 3? 7? It can harm those that are "average" - what about kids that were sadly already stupid? Or of above average intelligence? There could be some basis in truth here, but there is not nearly enough evidence to truly back it up as anything other than scientific conjecture.
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Male 262
The part I think people keep missing is that this is talking about adolescents, kids in high school. They`re saying it affects a growing mind.

"Prof Moffitt said adolescent brains appeared `more vulnerable to damage and disruption` from cannabis than those of fully mature adults."
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Male 689
was there a control group? also what were the circumstances of the people tested? this is crap. 8 percent is nothing, everyone loses knowledge over time. thats why the show "Who`s smarter than a 5th grader" works so well. pure bullpoo from the duke center
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Male 508
Bull. Funded by the Duke Center for child and Family Policy. Agenda much...
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Male 13,630
Sometimes being ignorant leads to a better life,
you dont worry about news, pooe going on, you just go on about your business, a lot of whack heads I know lead happier lives than most
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Male 3,894
Are you kidding me? You mean that someone won`t perform as well in an academic assessment once they`ve been out of school for roughly 14 years or more? I`m shocked.
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Male 2,988
sample of only 1000 people? and only 1 of 20 used at an early age? so 50 people is the real sample size being disputed?

also they claim that the early age smokes (small sample size of 50) dropped about 8 points and they say "Although eight points did not sound much, it was not trivial, she warned"

a quick search on IQ tests and you can find that the reliability of IQ tests has about 3 point standard deviation. so in other words, the odds are about two out of three that a person`s true IQ is in range from three points above to three points below the test IQ = range of 6 points.

my guess is that any real statistician could prove these results to be far from statistically significant.

in other words: this is most likely bullpoo
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Male 5,028
Funny how this version of the article does not point out the flaw in the study - that they did not bother to find out if the kids were also drinkers, and if so how much did they drink? Sounds to me like a study with an agenda with no regard for the truth.
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Female 836
I wonder what the statistics are for teenage alcohol users?
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Male 735
k im just gonna believe this random article, but honestly i`ll try pot at least once in my life but i`ll never smoke it erryday
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Female 29
“Adolescent-onset cannabis users, but not adult-onset cannabis users, showed marked IQ decline from childhood to adulthood."

i`m good :D
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Male 251
I think IbBored is mixing up the Calgary study with the AMA study. The Calgary study is ongoing and has not released any information on lung damage that I have been able to find. The AMA study had over 5000 participants. However, funny enough, the AMA study concluded that at smoking pot 20 times a month, you are likely to do the same amount of damage as if you smoked 120 cigs a month. Smoke more pot than that, and you`re doing more damage than smoking cigs.
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Male 950
It`s a risk I`m willing to take
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Male 1,249
New Research Says Smoking Pot Makes You Much Less Brainwashed Than the Average Slave Err Uhh We Mean Citizen
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Male 3,445
`Except for the 20 year study UofC did on cannabis on over 5000 participants with the conclusion that smoking pot `regularly` causes no long term lung damage.`

Again, this is about teenage use.
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Male 2,578
I think it really flies against all logic to think that something like Marijuana has no side effects.

And, surprise, they`re finding more about the side effects of alcohol every day.


http://www.worldpharmanews.com/research/2182-first-evidence-from-humans-on-how-alcohol-may-boost-risk-of-cancer

Of course these substances have side effects.
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Male 768
Yeap I can tell from my own personal experience. I used to have very good vocal skills and now I always forget words and meanings and talk like bloody Ozzy Osbourne sometimes. I really wish I stayed away from any drugs.
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Male 273
"...and yet the greatest ideas come when you`re high."

they sound great because you`re high...
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Male 72
Except for the 20 year study UofC did on cannabis on over 5000 participants with the conclusion that smoking pot `regularly` causes no long term lung damage.

Put that in your pipe and smoke it.
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Male 273
Doing any drugs daily while your brain is still evolving is a very bad idea... And drinking a lot of alcohol regularly even when you`re an adult does that too.
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Male 1,497
I`m as smart as I ever were.
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Male 78
More subjective studies with the findings reflecting the sponsor`s views. The only thing capable of lowering an individuals IQ is brain trauma. We`re not talking smoking a little grass, we`re taking severe head injury accompanied by brain damage.
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Male 1,243
I was just saying yesterday how this stuff destroys minds and lives. I think we all ready know about the findings, the evidence is clear, and has been for years.
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Male 687
...and yet the greatest ideas come when you`re high.
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Male 3,147
I`ll take the risk.... I don`t think smoking 30 or so spliffs a year is going to kill me.

Not unless I choke whilst stuffing my face full of munchies.
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Male 3,445
You should probably mention that this is about teenage pot users. Anyway, is it that surprising?
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Male 20,920
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