Drugs storm into the brain’s communication system and disrupt functioning of nerve cells. Drugs may either slowdown the process of sending and receiving the information by nerve cells or over stimulate the process of exchange of information.

Some drugs like marijuana and heroin deactivate the nerve cells and send abnormal messages and slows the functioning of the brain. Other drugs such as cocaine or methamphetamine stimulate the nerve cells and make the brain function abnormally.

Almost all drugs target the brain by flooding the circuit with dopamine, a neurotransmitter present in brain that control movement, motivation, and feelings of pleasure and emotion. When a person abuses drugs continuously, the brain starts to adapt to the excess dopamine by producing less dopamine. Thus, dopamine’s impact is lessened and reduces the abusers ability to enjoy the drugs as the days pass on. That is why drug addicts require larger amounts of drug than they took at first time. This continuous process increases their tolerance towards the drugs.

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