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Better. and today's marijuana could be more addictive. it has more of the psychoactive 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, o...

The rewarding effects. and likelihood of transition into addiction. >> how much stronger is it? >> you see the barbed wire obviously on the fence. >> i travelled 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. >> is pretty tight security. look at this door. >> mamood runs the marijuana potency project. >> what potency is this? >> about 8%. >> for three decades, his team analyzed weed confiscated from drug busts. >> 36% thc. you can smell it. it has ...

>> 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 >> well, i traveled to mississippi where marijuana is illegal, but here on the campus of one of the count...

Volkov. >> the thc content will go very fast into your brain. and then that increases, with the rewarding effects. and likelihood of transition into addiction. >> how much stronger is it? >> you see the barbed wire obviously on the fence. >> i travelled 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. >> is pretty tight security. look at this door. >> mamood runs the marijuana potency project. >> what potency is this? >> about 8%. >> for three decade...

Brain researchers, dr. norah volkov. >> the thc content will go very fast into your brain. at relatively high concentrations. and then that increases, with the rewarding effects. and likelihood of transition into addiction. >> how much stronger is it? >> you see the barbed wire obviously on the fence. >> i travelled 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. >> is pretty tight security. look at this door. >> mamood runs the marijuana potency pr...