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>> 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...

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 begin to smoke prior to the age of 16 and those who smoke after age 16. what we call early versus later onset. >> gruber's brain scans show the white matter, those are the highways that help the brain communicate from one point to another are impaired in those who start smoking early. >> maybe that there's underlying white ma...

Another are impaired in those who start smoking early. >> maybe that there's underlying white matter connectivity differences. >> that's your concern, it sounds like, that those highways, those white matter highways are just more disrupted in people who start smoking early. >> that's what we see. >> perhaps not surprising given what we know about the young developing brain. >> that's a very delicate time in brain development, and that's not a good time to be taking any drugs. >> preliminary research shows that early onset smokers are slower at tasks, have lower iq's later in life, higher risk ...

Another are impaired in those who start smoking early. >> maybe that there's underlying white matter connectivity differences. >> that's your concern, it sounds like, that those highways, those white matter highways are just more disrupted in people who start smoking early. >> that's what we see. >> perhaps not surprising given what we know about the young developing brain. >> that's a very delicate time in brain development, and that's not a good time to be taking any drugs. >> preliminary research shows that early onset smokers are slower at tasks, have lower iq's later in life, higher risk ...

To smoke prior to the age of 16 and those who smoke after age 16. what we call early versus later onset. >> gruber's brain scans show the white matter, those are the highways that help the brain commute from one point to another are impaired in those who start smoking early. >> maybe that there's underlying white matter connectivity differences. >> that's your concern, it sounds like, that those highways, those white matter highways are just more disrupted in people who start smoking early. >> that's what we see. >> perhaps not surprising given what we know about the young developing brain. >>...