More people are abusing drugs today than in any other time in history, and many of those people are youth. The connection between youth and drug abuse raises several questions, like: Why are young people at risk of drug abuse? Why do young people use drugs? What is wrong with doing drugs when people have been doing them for centuries?
Substance abuse has many negative physiological health effects, ranging from minor issues like digestion problems or respiratory infections, to potentially fatal diseases, like AIDS and hepatitis C. Of course, the effects depend on the drug and on the amount, method and frequency of use. Some drugs are very addictive, like heroin, while others are less so. But the upshot is that regular drug abuse or sustained exposure to a drug - even for a short period of time - can cause physiological dependence, which means that when the person stops taking drugs, he/she experiences physical withdrawal symptoms and a craving for the drug.
Drug abuse also causes brain damage. Again, depending on the drug, the strength and character of this damage varies. But one thing is clear, drug abuse affects the way the brain functions and alters its responses to the world. That is what psychoactive means, after all, something that acts on your brain.  | 
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