Marijuana & IQ

“Heavy marijuana use is associated with cognitive decline in about 5% of teens, according to a new study, which suggests that the heaviest users could lose 8 IQ points. In the report, published in the Proceedings of the National Academy of Sciences, research conducted in New Zealand showed that teens who started smoking marijuana before age 18 and were diagnosed as being addicted to cannabis by age 38 experienced an IQ drop in early adulthood. But users who began smoking after age 18—even if they used heavily— did not show a significant decline…”.* Ana Kasparian and John Iadarola (host of TYT University and Common) break it down on The Young Turks.

Read more here from MAIA SZALAVITZ in Time: http://healthland.time.com/2012/08/28/does-weekly-marijuana-use-by-teens-really-cause-a-drop-in-iq/#ixzz25Ks3D9We

Watch – Time to legalize cannabis? http://www.youtube.com/watch?v=-ficieq5AWk

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50 Comments

  1. CrabDaddy666 on May 19, 2019 at 7:24 pm

    I started smoking weed on a regular basis at age 16 and my IQ was 118. 2 years later at 18, it’s now 132. I’ve been smoking a LOT of weed the whole time.



  2. Connor Rudd on May 19, 2019 at 7:25 pm

    I JUST Got stoned before watching this XD



  3. Helios on May 19, 2019 at 7:26 pm

    Lmao I’m fucked



  4. baptiste babshow on May 19, 2019 at 7:29 pm

    Unless than what??  New Zealand scientist thinks he’s a time traveler to qualify compare what happened on his subject with or without the use of ganja, or … lmao 



  5. CC33 on May 19, 2019 at 7:29 pm

    Skylinefootball is correct. However, there’s more to it. What this study did leave out, the one mentioned in this video, is that these I.Q. drops go back to normal after marijuana use is stopped. Here is a source: http://www.spiritscienceandmetaphysics.com/study-finds-marijuana-increases-your-iq/. Also, light marijuana use is actually found to increase I.Q., while heavy use will slightly decrease it, but the biggest thing that this video left out is the fact that this I.Q. difference is temporary. This proves that marijuana doesn’t cause permanent brain damage, which has been proven. 



  6. dudej on May 19, 2019 at 7:32 pm

    Weed is the cause of all problems in modern society. It turns people into losers and thugs on the streets, and is just a waist of money. Do not let this stuff be legalized.



  7. Dallas Smith on May 19, 2019 at 7:34 pm

    What a dumbass.



  8. Yiğit Zia on May 19, 2019 at 7:35 pm

    United States of Turkey



  9. Ernesto Huaman on May 19, 2019 at 7:35 pm

    IQ is not an absolute measure of intelligence. It is just a limited and relative measure of mental capaciy. The use of marijuana makes young people reject the arthritic way of thinking of official culture..



  10. Timothy Morrill on May 19, 2019 at 7:35 pm

    This study has been thoroughly debunked because it did not factor in socioeconomic class.



  11. beau postma on May 19, 2019 at 7:37 pm

    ” can you imagine the day people are obligated to smoke marijuana” Yes…. Yes I can that day is now.



  12. XYZLeo on May 19, 2019 at 7:38 pm

    Marijuana does not directly have an impact on one’s IQ and intelligence. The reason that the studies results yielded as they did is because marijuana causes you to be lazier and unmotivated- all of the time that they spent high could have been studying and getting smarter. The weed wastes your time. It indirectly make you dumber. The drug of THC itself does nothing to your brain to actually directly make you de facto less intelligent. This is why the results yielded as they did.



  13. 4malulz on May 19, 2019 at 7:38 pm

    So where is the study done on think tanks, and the ability to think outside-the-box, let one group smoke some pot, and watch how creative they become. Where’s that study?



  14. Poopy on May 19, 2019 at 7:38 pm

    i remember plenty of things when i started smoking at 17. I’m 20 now



  15. Gehenna71 on May 19, 2019 at 7:39 pm

    Drugs, alcohol, medication, alex jones or facebook games … it all stops the brains from developping.



  16. brumartube on May 19, 2019 at 7:41 pm

    IQ test measures your competence to pass IQ tests, and the ability to give the answers people expect you give. Smoking enough cannabis might just makes you less interested in such matter.



  17. Glen Glen on May 19, 2019 at 7:42 pm

    I find my attention span is much greater when I’m a little high. I started smoking weed in my mid 20’s and my studies greatly improved and I believe it was because it’s hard to get frustrated when high and I just kept up with it.



  18. Jenny Mason on May 19, 2019 at 7:44 pm

    All it does to me is make me laugh while looking for shit I hid in plain sight. 😂😂😂😍
    C’mon, it relaxes you in a stressful situation and has more healing qualities than pills do!



  19. ᅚᅚ ᅚᅚ ᅚᅚ ᅚᅚHi on May 19, 2019 at 7:44 pm

    I’ve got *Autism* can it help me???



  20. EDM Lover on May 19, 2019 at 7:45 pm

    I started at 17 , is that bad?



  21. TOKETILICROACK on May 19, 2019 at 7:45 pm

    Marijuana opens your third eye increasing wisdom perception mental ability experiencing bliss while your iq tests most like contain questions generated by brainwashed education which is complete bullshit. 



  22. Oliver Awils on May 19, 2019 at 7:47 pm

    "united states of Britain" Bruh 😂



  23. Lampros Dimou on May 19, 2019 at 7:48 pm

    Even Iq is not a number, i doubt that it makes u less intelligent… shit is rediciulous first schizophrenia and now this… try it again its safe.. even i hav’nt smoke o joint of it lattely.



  24. Grizthegreat on May 19, 2019 at 7:49 pm

    You should collectively gather information from the internet before you decide if you should put down the bong. Dopemine, sleep pasterns, munchies, memory, motivation, etc. The choice is yours. I quit after 4 years. Do your negatives outweigh your positives? Do you understand how THC affects your body and mind before you simple burn one?



  25. Krystof D. on May 19, 2019 at 7:52 pm

    I’m smoking ganja since 14. I’m 17now and i am A-B grader without even learning much. My parents know that I smoke and they know it’s bullshit, those propaganda stuff. The only important thing is no chemicals, growing in a garden with pure vegetal compost so the plant can grow strong and healthy. No alcohol man, spliff than you can concentrate and learn fast. School can be easy, math will become piece of cake.



  26. nightcrawler on May 19, 2019 at 7:55 pm

    being around stupid people makes you also stupid, watching TV and reading the wrong information makes you also stupid. so who cares and NO I"M NOT A POT SMOKER myself. And IQ doesn’t say anything some kids are slow at school but are street smart. I bump into alot of people who did / do well at school but has no common sense what so ever so. They completly ignorant even though they have a good job exc, look at politicians and people you see on television complete morons yet they suppost to have a decent IQ.



  27. jamtart22 on May 19, 2019 at 7:59 pm

    I hear this study cited over and over again but they only measured the iq about 35 pot users…… 35 PEOPLE. That is utterly MEANINGLESS.



  28. ALeeann on May 19, 2019 at 8:00 pm

    Hmm…I dont know if this applies to ALL people though. Pot seems to enhance interest by making everything more fun. When I get high, I get a lot of joy out of reading science, history, law, etc books. Seriously, if u are high it takes a little bit longer to read, but wow books(and movies and music and food and sex lol) are so much cooler when your high. So I guess it just depends on how you use your "high".



  29. Shqipe GanjSmoker on May 19, 2019 at 8:01 pm

    I started at 18 🙂



  30. Czerwona Pigułka on May 19, 2019 at 8:04 pm

    hmmm. i always noticed i scored best scores in mind quiz day after smoking. but that was not heavy marijuana usage.



  31. Jahan Mahabub on May 19, 2019 at 8:07 pm

    Anyone tested out the Rotogenflux Methods (search on google)? I have heard many amazing things about this popular course.



  32. rahim nogood on May 19, 2019 at 8:08 pm

    i’m 23 i start smoking weed when i was 13….and from 14 to 23 i smoke it dailly…and my iq is 162…so pls stfu



  33. Reelphresh on May 19, 2019 at 8:09 pm

    But fluoride is good for your kids so you must get their teeth varnished every 3 months for their own good, almost right from the day they are born.



  34. Dovlock on May 19, 2019 at 8:10 pm

    I am 13 and I smoked weed that was 2 cm’s long! What is gonna happen to me?



  35. Alexis Sanko on May 19, 2019 at 8:10 pm

    I smoked for 2 years non-stop starting at 15 y/o. Now I am 21, and I can hardly remember anything during my teens or before. My IQ has definitely been effected, and I have had to battle depression since the day I quit. I couldn’t see how it was effecting me while I was smoking, but I realized after I quit how much I was missing. I wish I had never touched though.



  36. skylinefootball on May 19, 2019 at 8:12 pm

    I don’t buy all the developing brain bullshit its just the save the children argument being regurgitated. All the kids who smoked weed under 18 in this study were probably pulled out of the ghetto and all the participants over 18 where probably folks from the burbs. I wouldn’t put it past those prohibition loving bastards just trying to throw another wrench in the way of legalization.



  37. smirkovs on May 19, 2019 at 8:12 pm

    "United states of britain" hahahahaha



  38. J Sparker on May 19, 2019 at 8:13 pm

    Who needs school when I got the Internet. I was pushed through school with a 3.5 GPA for athletic reasons but I’ve learned a lot more online than I did in the joke of a public school system in America, where obedience is more important than learning skills to help in life.



  39. What the fuck are you doing reading my username? on May 19, 2019 at 8:13 pm

    8 IQ points? Doesn’t seem much at all.



  40. Bluey Care Bear on May 19, 2019 at 8:15 pm

    Tesla and Einstein said they’ll lend a few IQ points to us.



  41. xHeatProof Spy on May 19, 2019 at 8:16 pm

    Love weed



  42. Alfred Braun on May 19, 2019 at 8:16 pm

    i stared smoking pot when i was 12. smoked it for 20 + yrs. quit.
    now i’m fucked.



  43. skylinefootball on May 19, 2019 at 8:17 pm

    I don’t trust this study there is probably some huge flaw in it just like the heath tulane study but by the time this study gets debunked most people will already have accepted it as fact.



  44. Avery Veber on May 19, 2019 at 8:18 pm

    Yeah but look at all the other factors that directly damage the brain function and IQ.  Cannabinoids protect the brain from neurotoxins found EVERYWHERE, food water clothing air medicine vitamins EVERYWHERE.  



  45. john vu on May 19, 2019 at 8:18 pm

    Obama, the science guy, Steve jobs , bill Clinton, smoked pot in as kids



  46. TheGreatCharlie749 on May 19, 2019 at 8:19 pm

    ana is such a hottie here, holy fuck



  47. Jeremy Smith on May 19, 2019 at 8:19 pm

    "United States of Britain"😂😂😂😂😂😂😂



  48. Koolaid Rehab on May 19, 2019 at 8:19 pm

    they dont care



  49. StraightUp 4583 on May 19, 2019 at 8:19 pm

    Bush did 9/11



  50. Illinoize420 on May 19, 2019 at 8:21 pm

    Hey dudej your retarded weed is less harmful than caffeine hell most people know it’s not harmful at all especially when not smoked but vaporized and eaten