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Psychologically, politically, morally, we need to say, as nancy reagan said, "just say no." don't do it, there's no excuse for this, it's not recreational. >> tom: then in what is probably a direct reaction to snoop dogg's music video, he attacked marijuana. >> i reject the idea that were going to be better placed if we have more marijuana, you can just go down to the corner grocery store and get it, give me a break. high-purity thc content, it's not a healthy substance, particular for young people. >> i like this guy. he's cool. he >> tom: he is astonished. >> i'm astonished to hear people su...

Cortex, which helps people think ahead, control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel-good cannabinoids of your own. until your body kick starts production, you feel lousy, so many people smoke again to feel better. and t...

But we are talking about children, young children. and that's going to understandably raise concerns. the latest research shows some strains of marijuana do have a profound effect on the brains of users under the age of 25. >> thc in some good studies have been linked to psychiatric disorders, memory disorders in children under age 16. even though it's low thc content. there may be long-term side effects. >> what are you worried about the most in the long run? >> the fact that we don't understand the long-term effects of this medication in brain development. >> these are tough choices, made ev...

Marijuana, then the thc content is going to go very fast into your brain at relatively high concentrations, and then that increases its rewarding effects and likelihood of transitioning into addiction. >> how much stronger is it? >> you see the barbed wire, obviously, on the fences. >> well, i traveled to mississippi where marijuana is illegal, but here on the campus of one of the country's oldest universities, ole miss, a huge stash of marijuana is under lock and key. >> this is our vault. >> this is some pretty tight security. look at this door. >> mahmoud el-soli runs what's called a mariju...

That's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there's something else that addiction experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana called cannabinoids, remember them? they cause your brain to stop producing its own natural cannabinoids. when you stop smoking, you have no feel good cannabinoids of your own. until your body kick starts production, you feel lousy, so many people smoke again to feel better. and today's marijuana could be more addictive. it has more of the psy...