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That explains why adolescents are much more vulnerable. >> theres 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 todays ...

Neuroscientist carl hart. >> there are not many people studying marijuana. its very difficult to get approved to study marijuana. >> whats nice about israel is that the government is helping the research to happen. >> and its 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. >> theyve been able to show that it can decrease the amount of brain damage from head injuries in mice. >> r...

>> turns out when you test people who have a lot of experience with cannabis, you dont 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 cant 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, t...