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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 psychoactive ingredient thc than ever before...

Neuroscientist carl hart. >> there are not many people studying marijuana. it's very difficult to get approved to study marijuana. >> what's nice about israel is that the government is helping the research to happen. >> and it's research that could give hope to patients like charlotte figge. scientists in israel are learning that marijuana use might actually protect the brain, not damage it. >> they've been able to show that it can decrease the amount of brain damage from head injuries in mice. >> right. to be able to give a medicine after the injury to reverse some of the damage, that's huge....

>> turns out when you test people who have a lot of experience with cannabis, you don't see many disruptions, but if you test people who have sort of limited history with cannabis, you can see some clear pronounced disruptions. >> of course, no one thinks that driving when using marijuana is a good idea, but what scientists can't answer is if there is a safe legal limit and people who use marijuana daily as a medicine should be able to drive. how impaired are they? >> what is more clear, though, the effect of marijuana on the young brain. >> what we see is a very big difference in people who b...