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Appearances aside, the verbally abusive individual is broken internally. The identity they present to the world, and often to themselves, is a facade. Abusers tend to have little or no clue that they have a problem.
1 Substance abuse can look like uncontrollable use of a substance to a point that is physically dangerous, or frequent continued use over time. They may engage in risky behaviors as a result of the abuse.  Often, those with sociopathic tendencies grew up in a home or with a caretaker that also abused drugs or alcohol.