most of these addicts have developed mental illnesses from years of hard drugs, we all made bad choices but some people weren't lucky enough to get past the decision to try drugs, i had a friend who was a very nice person and now he is just gone mentally from 25yrs of using, and it's sad, if he just had help from a friend at the right time things might have turned out better.
That "crackhead" could be a real nice person behind the addiction and if someone would see past that and help he might get his life back one day.
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