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Sculpting Your Brain: The Science of Addiction

You make a lot of important choices in your teen years. Some of them can’t be unmade, and can have an impact on your life for years to come.

One of those choices may be about using drugs. It’s an important choice because, for starters, using drugs can affect the way your brain develops.

Crucial connections

We’ve described how your “brain circuits” coordinate everything you feel, think, and do. These circuits are formed by billions of neurons (nerve cells) that are connected to one another. When you think or do something, messages are sent across the connections, or synapses, between neurons.

In healthy brain development, synapses that are used over and over grow stronger, and synapses that aren’t used much get weaker. This process is called “synaptic pruning.”

In a way, your brain gets smaller—fewer connections between brain cells means less “gray matter”—but the connections that are left are more efficient.

That may sound a little weird, but it’s normal. See the brain images in the upper-right corner of this page, which show a healthy brain developing from ages 5 to 20. In both the side view and top view of the brain, the reduction in gray matter—due to unused synapses—is shown by yellow turning to blue.

New skills—and risks

Images like this taught scientists that a person’s brain changes dramatically from childhood through young adulthood. Those changes may be strongly influenced by your experiences during that time, including the choices you make. Those choices and actions can “shape” your brain, like an artist creating a sculpture by chipping away marble.

The easily sculpted brain in the teen years helps you do things like develop language skills or understand new concepts—but the process can also reinforce thinking and behavior that doesn’t help you.

This may be one reason that the earlier a person begins using drugs, the more likely the person is to develop a drug problem, including addiction. That’s why we say addiction is a brain disease.

The brain still changes even when you’re an adult; it may be that nothing is “hard wired” permanently. But the earlier you learn to do something, the more “strongly wired” that behavior is, and the harder it is to unlearn it later.

Before you choose to use drugs, remember that the possible consequences for your brain can last a very long time.


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