The use of alcohol, prescription pharmaceuticals, or over-the-counter medications for purposes other than those for which they were prescribed, or in excess is referred to as substance abuse. Problems with substance misuse can be:
Two major substances that is abused by teenagers are;
Drug or alcohol abuse can weaken the immune system and lead to seizures brought on by dehydration.
This makes one more vulnerable to infections and other problems, to psychotic behavior, and to dangerous cardiovascular diseases like heart attacks and vein collapse.
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