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Ingredient thc than ever before. brain researcher dr. nora volkow. >> if you smoke a very potent marijuana, then the thc content is going to go very fast into your brain at relatively high concentrations, and then that increases its rewarding effects and likelihood of transitioning into addiction. >> how much stronger is it? >> you see the barbed wire, obviously, on the fences. >> well, i traveled to mississippi where marijuana is illegal, but here on the campus of one of the country's oldest universities, ole miss, a huge stash of marijuana is under lock and key. >> this is our vault. >> this...

Into addiction. >> how much stronger is it? >> you see the barbed wire, obviously, on the fences. >> well, i traveled to mississippi where marijuana is illegal, but here on the campus of one of the country's oldest universities, ole miss, a huge stash of marijuana is under lock and key. >> this is our vault. >> this is some pretty tight security. look at this door. >> mahmoud runs what's called a marijuana potency project. what's the potency of this? >> this is about 8%. >> for three decades now his team has analyzed weed confiscated from drug busts. >> this is 36% thc. you can smell it. it ha...

>> this is our vault. >> this is some pretty tight security. look at this door. >> mahmoud runs what's called a marijuana potency project. what's the potency of this? >> this is about 8%. >> for three decades now his team has analyzed weed confiscated from drug busts. >> this is 36% thc. you can smell it. it has a good aromatic smell. >> how much is this worry you, 36% thc confiscated? >> very dangerous material. for someone that is not experienced in marijuana smoking takes some of this, and they're going to go into the negative effects of the high, the psychosis, the irritation, irritability...

>> if you smoke a very potent marijuana, then the thc content is going to go very fast into your brain at relatively high concentrations, and then that increases its rewarding effects and likelihood of transitioning into addiction. >> how much stronger is it? >> you see the barbed wire, obviously, on the fences. >> well, i traveled to mississippi where marijuana is illegal, but here on the campus of one of the country's oldest universities, ole miss, a huge stash of marijuana is under lock and key. >> this is our vault. >> this is some pretty tight security. look at this door. >> mahmoud runs ...

Marijuana, then the thc content is going to go very fast into your brain at relatively high concentrations, and then that increases its rewarding effects and likelihood of transitioning into addiction. >> how much stronger is it? >> you see the barbed wire, obviously, on the fences. >> well, i traveled to mississippi where marijuana is illegal, but here on the campus of one of the country's oldest universities, ole miss, a huge stash of marijuana is under lock and key. >> this is our vault. >> this is some pretty tight security. look at this door. >> mahmoud runs what's called a marijuana pote...