Does Marijuana Cause Permanent Brain Damage in Teens?



Is the American Academy of Pediatrics’ opposition to cannabis legalization just reefer madness revisited? Subscribe to Dr. Greger’s free nutrition newsletter and …

33 Comments

  1. What about consuming cannabis through eating it, like in a cake? Is there anything that has been researched to show how that compares to the smoking/vaping of the plant?

  2. I used cannabis in my teens years..
    It did caused me a lot of problems that I still battle 8y after stopping weed (I stopped at 16)
    It triggered HIGH anxiety, Psychoses, Possibly ADHD, Possibly BPD, Possibly Some schizo-typical problems, MOST probably brain damage as I have mild difficulty of communication and movement control that I DIDN'T had prior weed.

    So yes, theres a big risk as a teen to take ANY drugs EVEN prescribed ones.

    All those problems got 10x worst after only 2y of concerta (ritalin) at age 20.

  3. Been using it daily since last year when I was 16, now I can barely remember anything and feel high when I haven't even smoked. I hope this isn't permanent.

  4. Darn. I’m high right now. Practically depressed and not doing well. School family, social, job, health. About to turn 25. Started at 18. So sad about that :(. Made some dumb decisions. The devil is alive and well today.

  5. In my uneducated opinion from personal experience, cannabis use isn't causing the brain damage, but the damage is causing the use.

  6. I'm a 24 year old who consumes marijuana daily in small amounts. I also played youth football at ages 10 and 11. After participating I noticed an extreme decline in social, behavioral, and cognitive abilities. Old hobbies such as going out, hanging with friends completely didn't interest me anymore. There seemed to be a problem with my dopaminergic pathways, some sort of reward deficiency problem. I started smoking cannabis at age 16 to "self-medicate" and help with the loss of excitement and function in other areas. Whether the drug made it worse over time, lowered my iq, or affected my brain in other ways I have no way of knowing, but in my uneducated opinion, people who begin to use cannabis probably already have an affected or damaged brain.

  7. I’m a teen and I feel like I damaged my brain by smoking I just wanna feel normal again how can I do that ? Answers please ?! I realized that smoking because my “friends” where wasn’t cool

  8. Ehm I’m 16 I have an IQ of 123 but i’ve been smoking since 13 yo. Is this irreversible?
    So What if i got really high. That feeling you feel the next day doesnt go away?
    And if i wanted to stop smoking weed but I still have 2 joints that i wanna smoke the last time.
    Should i smoke em all at the same day or acros 2 weeks to prevent brain damage?

  9. I started smoking at 13 and smoked regularly through till I was 19. Still got above average marks when I finished school and regularly 85% scores at postgraduate university level. Would love to know what I could have done had I never gone down that pathway as a young, disengaged teen…

  10. I see all these cannabis videos from him now, but I don’t see anything from him about using it as a source of plant-based nutrition, and this is disappointing since he lives in DC, illegal grow city. Cannabis is extremely nutritious

  11. Noticed that the study he quotes "Persistent Cannabis Users Show Neurological Decline…" (Meier et al) identifies users 24 hours post cannabis use and determines the problem remains. On the other hand, the study "Reply to Rogeberg and Daly: No Evidence…" shows that the effect of cannabis use persists up to three months after use – but not beyond. Makes me wonder if Meier et al would've found different results if they'd required study participants to lay off the weed for three months prior to IQ testing.

  12. As a Kid, I grew up with the "Dare" program. TBH it scared the crap out of me which caused me to not do drugs and alcohol. So dare was probably not effective for a lot of kids but it was effective for some kids.

  13. What is considered to be the cut-off for regular marijuana user? Do you have to smoke daily or more to fall into that category?

  14. Yes, but longterm effects of any drug are probably more severe if exposed to kids and adolescents anyway, not to mention most people aren't heavy users so one could assume cannabis is probably not that damaging to the average healthy occasional adult user.
    (i'm assuming).

  15. I smoked from high school to age 27 and haven't smoked for 5 years. I often wonder if it's caused permanent damage. I still question these studies though. The brain is extremely complex and adaptive. If there is permanent change, I think over time it will find harmony within the dysfunction or actually repair the dysfunction in some. We're all very different and will have varying abilities to heal something like that.

  16. I was in the top of my classes in high school without trying …then in late teens I started smoking weed and drinking booze for 10 years and my brain was so fried I could hardly string a coherent sentence together. Found God and He changed my life after being weed cigarette and alcohol free (and vegan) for 7 years i am now attending uni getting A’s…I don’t know whether I have permanent brain damage or not but I do know I threw away the best years of my life on that ** and wish I’d never touched the damned stuff.

  17. Makes sense. You’re depriving your brain of oxygen. Don’t smoke it, instead bake it into brownies.

  18. They should do studies using landrace strains. They are radically different than modern hybrid strains which have incomplete molecular structures due to their reckless breeding ancestry…

  19. Marijuana does cause brain damage in unborn children ….we know that much !

    If your father was a chronic weed abuser and then had children…those children have less motivation to exert energy

    They become chronic couch potatoes for the remainder of their lives!

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