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Frustrating, like mixing paint. and then just sort of get into this state of, you know -- >> and why that happens is exactly what columbia university neuroscientist carl hart is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> the effects will be disruption in memory, disruptions in inhibitory control. they will become slower at cognitive functioning, a wide range of things. these effects are temporary, but they're pretty pronounced, and they are clear. >> and it's slowly becoming clear to scientists what part of the brain...

Marijuana's not just psychologically addictive, but also physically addictive. so give me an update. how are you doing? >> dr. christian thurstone runs one of colorado's largest youth substance abuse clinics. the number of marijuana addicts he treats has tripled in the last three years alone. >> literally, i cried about it. marijuana is number one on their list of priorities. they have dropped out of life. >> back in the day, i wouldn't have felt like my day had really started unless i got high. >> joel vargas started smoking when he was just 13. by 15, he was smoking more than a dozen times a...

Doug and healther this is so said. should they be tried as adults motorcycle mike skakel was charged. >> he was an adult when the charges came. >> that is a good point. here with the preliveeration and explosion of violent video game ands movies, we need to try for deterients and try them as adults, there is an interesting way that it all works. most of the time when they are adults, they get sentenced as juveniles. >> i don't know if it will deter. the fact of the matter, children don't have brains that are fully developed. prefrontal cortex is not there. whether or not that will deter young ...

Adults can, but the problem with that is that their prefrontal 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, y...

Frustrating, like mixing paint, and then just sort of get into this state of, you know -- >> and why that happens is exactly what columbia university neuroscientist carl hart is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> the effects will be disruption in memory, disruptions in inhibitory control. they will become slower at cognitive functioning, a wide range of things. these effects are temporary, but they're pretty pronounced, and they are clear. >> and it's slowly becoming clear to scientists what part of the brain...