The blood - 02:47 The blood-brain barrier: barrier between...

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02:47 The blood-brain barrier: barrier between the blood and the fluid that surrounds neurons; this semipermeable structure protects the brain form potentially toxic chemicals circulating in the blood Gateway Drugs : hypothesis that the use of less deleterious drugs may lead to a future risk of using more dangerous hard drugs and/or crime. It is often attributed to the use of several drugs, Students that had not used beer or wine as gateways were much less likely to be marijuana smokers at end of study Cigarette smokers 2x more likely than nonsmokers to move onto marijuana Study of 375 kids proved that knowing which substances first used may not be very important in helping to prevent future escalation of drug use More likely: early alcohol use and cigarette smoking are common indicators of the general deviance-prone pattern of behavior that also includes an increased likelihood of smoking marijuana or trying cocaine Think of use of gateway substances not the cause for illicit drug use, but instead, as an early
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The blood - 02:47 The blood-brain barrier: barrier between...

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