Adrenaline, for example, has a highly addictive quality to it as does dopamine. You have maybe heard the term, adrenaline junkie, to describe someone who gets off on taking risks. This can be physically putting their bodies in situations that foster a sense of danger or adventure or it could look like playing the stock market, making risky investments, cheating on a spouse, gambling, porn, lying or any other number of risky behaviors. This can also be observed in the intensity that is so common to many modern action, horror and suspense tv shows and movies. They get your adrenaline pumping! There is an element of risk and an element of reward in these behaviors that's where the dopamine comes in. Over long term, the body's biochemical receptors change so that more dopamine is needed in order to sustain the feeling of reward and more adrenaline is needed to amp the feeling of risk. Eventually, the endocrine system burns out. This is unsustainable. These are also the same chemical responses that were generated in childhood.