Are Drugs Addictive?

My daughter, newly gone off to college, had heard in her classes that drugs were not addictive. Here is my answer:

“Random question, I have a friend here who believes that most drugs are not actually addictive, is that true?… They said that especially weed was not addictive at all.”

Let’s set about answering it. First, as always, we must consider our definitions. I assume that when speaking of drugs you mean non-prescription use of generally mind altering substances (such as alcohol), some of which are often illegal to possess or use (such as cocaine, heroin, amphetamines, etc). If your friend has a different definition of drugs, please let me know.

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