Why do people have a beer? Or drink a glass of wine? Or smoke a joint? Why do some become alcoholics? Or eat junk food? Or overeat in general? Why are so many people unable to control their urge to eat too much, leading to 85% of the population being overweight or obese? Why do people sit in a sauna? Or go to a concert? Or meditate? Or exercise? Why do some people become addicted to exercise? Or stare at their phones all day? Why do some people become addicted to a screen or video games or social media?

Why do people do anything? It's all the same fundamental reason.