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Complications could include:
Drug abuse occurs when you're unable to control your use of prescribed drugs or you're using another legal or illegal substance to the point that it interferes with your ability to function. According to the National Institute on Drug Abuse, more ...
Nicotine addiction occurs when a person becomes addicted to nicotine, which is a chemical found in tobacco. The addiction is physical, mental, and behavioral.
Read about the differences between alcohol abuse and alcoholism.