I don't know Greenwood, I think the dopamine reward system is something none of us can escape from, it's how our brains work. It's where we get our motivation and survival instincts from. If I was forced to live without it I think I would wither away. You say you live without it, but I find that hard to believe, you must have things that you find rewarding and pleasurable in your life. For some people the reward is in the denial of the pleasure, I'm not saying that's you, obviously I don't know you. Even something as basic as eating is pleasurable or being outside on a nice day, ahhhh that sun feels good!