How Do We Turn Chocolate Into an Addict?

If we turn chocolate into an addictive drug, its value sky rockets. These drugs release a neuro transmitter dopemin in the brain which actually tells our systems the whatever action we just did, we got a huge reward. And so we learn to make those actions loads and much faster than we do any other action. Because it's got such a huge value, you repeat it more often - what we call gold directed learning. Or so we think.