Settle down boys you’re both right. Addiction is complex. It’s both behavioral and physiological. By definition. The brain releases dopamine. The machine flashes bright lights and rings bells and makes you feel like a winner. It all works together, and as long as you think of it as entertainment, it can be a lot of fun. Keep in mind though that slot machines are essentially the crack cocaine of gambling. People tend to get addicted to them quickly and unexpectedly.