Addiction? No, that term is tossed around too loosely.
For me, the internet has replaced newspapers, (some) TV, (some) magazines, dictionary & encyclopedia, writing and reading most paper letters, and some other things. It has not replaced going to a restaurant, cooking, cleaning, (some) shopping, taking care of plants, playing with my cat, talking to/socializing with friends or family, going to a live theatre production, or enjoying nature.
This forum (or other forums) are a very small part of my internet usage.