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Overdoses. and perhaps one of the biggest reasons most people think pot is safe. in fact, a new study of children, showed that by high school, only one in five think marijuana is harmful. that's the lowest number in more than two decades. and something we have heard over and over as we traveled around the country. >> not really that harmful. >> it has a lot of benefits. not really too concerned about it. >> i think it's safe, if you're a safe person. >> but the experts we spoke to said there is more to the story. >> there are people who compulsively smoke, who want to stop smoking, but they ca...

It can lead to panic attacks or anxiety attacks in people. >> how do you know when you've done too much? >> simple tasks become very frustrating. like mixing paint. and then just get into a state of ahhhhh -- you know. >> and why that happens is exactly what columbia university neuroscientist carl harp is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> effects will be disruption in memory. disruptions in inhibitory control. they become slower at cognitive functioning. a wide array of things. they are temporary, but pronou...

Safe. in fact, a new study of children, showed that by high school, only one in five think marijuana in high school. that's the lowest number in more than two decades. and something we have heard over and over as we traveled around the country. >> not really that harmful. >> it has a lot of benefits. not really too concerned about it. >> i think it's safe, if you're a safe person. >> but the experts we spoke to said there is more to the story. >> there are people who compulsively smoke, who want to stop smoking, but they can't stop smoking. >> in fact, 90% of marijuana smokers will become depe...

Control their impulses, that's not fully developed until age 24. that explains why adolescents are much more vulnerable. >> there is something else experts believe is likely happening in the brain. when you smoke pot, the feel-good chemicals that make up marijuana, called cannabinoids, force your brain to stop producing their own natural cannabinoids. when you stop smoking be with you don't have them on 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. more of the psycho active ingredient ...

And then just get into a state of ahhhhh -- you know. >> and why that happens is exactly what columbia university neuro scientist carl harp is investigating. >> exhale. >> research subjects in his lab smoke marijuana and then take a variety of cognitive tests. >> effects will be disruption in memory. disruptions in inhibitory con control. they become slower at cognitive functioning. a wide array of things. they are temporary, but pronounced and clear. >> it is slowly becoming clear to scientists what part of the brain is most effected. the prefrontal cortex. >> it is very important for plannin...