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Drug Users are Losers. (Unit 1: Drugs and You).(numbers)
Addiction is a problem for many people. Consider these statistics:
* More than 600,000 people in the United States are addicted to heroin.
* 120,000 people enter treatment each year for marijuana addiction.
* More than 62 million Americans are addicted to the nicotine in the cigarettes they smoke.
Being addicted to a substance means that people keep using it even if they want to quit and it is damaging their lives. They are physically and psychologically dependent on it and believe they can't function without it. They have developed a tolerance to it, which means they have to use more and more of it to get the same effect. When they stop using it, they experience withdrawal symptoms, such as vomiting, headaches, and depression.
What does trying a cigarette, just once, have to do with addiction and brain damage and the other bad things about using drugs? To find the answer to that question, you have to look deep inside the human brain.
Whether a drug is smoked, swallowed, inhaled, or injected, it eventually reaches the brain. Drugs produce their effects by changing the way neurotransmitters in the brain function. Neurotransmitters are chemical "messengers" in the brain that carry signals from one nerve cell to another.
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