best activity for you is one you enjoy without affecting relevant parts of your life like work, family, time with yourself and your health. It’s different from addictions in three aspects:
First, addiction is hard to control. Sometimes you miss pass of time and keep from doing things needed to be healthy: taking shower every day, having necessary meals for each day and even going to toilet!
Also, addiction becomes most important thing in your day leaving aside valuable time with ones you love (family, friends, lovers and yourself).
Finally, addictions are improductive. Productive time allows you to grow emotionally, to create patrimony, or even to make bonds with potential partners for future in your life.