When we are little we see the way our parents or elders act and that tells our brain that is the correct way to act. As we grow up the things they tell us we will become is what we think will happen and so we do that in fear that we will disappoint them.
Drug addiction is a chronic, relapsing illness.
I hope this helps. (^_^)
True, if we exercise we have energy
Like throwing up because it makes sense