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Studies done on u.s. diplomats and their families who the u.s. government says suffered unexplained health incidents in havana in 2017. a top cuban doctor is calling the methodology and results into question saying, quote, if the control group was not well matched, the differences could be due to uncontrolled factors. for example, he says, for both groups was head concussion history, sports, military service, matched? no evidence is provided of the degree of overlap of patient and control group. the functional connectivity differences, he continues, the second type of measure, can change due t...

Communicate 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. >> 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...

And those that smoke after age 16. what we call early versus later on set. >> gruber's brain scan show the white matter, the highways that help the brain communicate from one to the other are impaired in those smoking early. >> maybe there's connectivity differences. >> that's your concern it sounds like. that the highway, the 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 ta...

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 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 ...

>> 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 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 t...