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Well, yes, you could argue that people who act in counterproductive ways after they start doing drugs already had major personality defects to start with.
The trouble is, in my experience it all seems to go the other way -- normally decent and responsible people (who had little trouble in school or at work, for example) start doing some drug regularly and heavily, alcohol or pot or meth or whatever, and then it seems like all their thoughts and actions become more present-oriented, focused on short-term pleasure. It doesn't happen in every case, and often the effects aren't permanent, but like I said, I've seen this happen too many times to try to explain it away as, "Well, they must have just had a defective 'addictive personality' from the start!"
I'm not trying to absolve people of responsibility, just describing a chain of events that I've witnessed a good number of times. IMO, it's a heck of lot sillier to contend that heavy drug use doesn't also typically change how people behave in their sober moments. To people who have known addicts, that idea clearly rings false.
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