What you see is a myosin protein dragging an endorphin along a filament to the inner part of the brain's parietal cortex which creates happiness."
What an amazing era we live in where we can see science, not just read about it. It confirms in my mind what I've always known, that alcohol and drugs, and anything else that produces euphoria, is akin to throwing a monkey wrench into an extremely complex system and is responsible for many of the mood disorders people have. If someone truly has a chemical imbalance, the worst thing they can do is to self-medicate it with alcohol or drugs. The death of Prince coming to mind as the latest public example.