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prefrontal cortex it's very important for planning thinking coordinating your behaviors there are what is more clear though is the effect of marijuana on the young brain what we see is a very big bad at his bedside his father Shaun watched his son go from being catatonic to what he calls high as a and it's perhaps one of the biggest reasons most people think pot is safe in fact a new study of children showed that by highschool only 1 in 5 think marijuana is harmful that's the lowest number in more than Rapid tone shark tank two decades and it's something we 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 for addicts but the experts we spoke to said there is more