Obvious answer would be the chemicals in your brain being released to cause euphoric feelings are triggered by something which the person has found out makes them happy, so they keep doing it. Or addictive substances like nicotine etc.
But why? Why do people feel the need that something (alcohol, smoking, Rx drugs, other drugs etc.) excessively or fucking daily is the only way to enjoy life, even when you try to help them out of it?
I've been having troubles with my father. He's finally stopped drinking after 5 miserable years, but now he has somehow got a hold of muscle relaxers, and is stealing my brother's Adderal. A friend of mine just does drugs all the time, and I'm not completely against drugs, I just don't see why he's become such a loser in my eyes.
I really think my dad has co-dependency issues...but that could just be far reaching. I just hear him say all the time 'I can't live without 'this' (which can include drugs, alcohol, some activity, or my mother) and it drives me NUTS!
What makes people addicted to having to need something else to make them feel whole?