What are some effects of drug and alcohol abuse among teenagers?

As a teenager you're still growing. If for example the drug has nicotine in it. It sinks into your blood stream and once your fully grow. The body then continues to crave the nicotine and think it needs the drug to live, so a natural response is to take in more and more of the drug. It may make it feel better, but it is making your heath worse for every intake of the drug.