Group chats (Ventrilo, raidcall, axon, discord, MSN, yahoo chat, AIM, etc)
Not sure if I can call it a addiction but I always wasted hours being in groups thinking it was worth the time to talk to people - my main wanting to do so was to talk about video games, anime, movies and technology.
Was a waste of time mainly cause
1. people were unavailable (offline, afk)
2. People were talking about other stuff that I wasn't interested in
3. People kept making sex jokes, racist jokes, etc with each other to the point where it was pretty uncomfortable and make you think these people are fucked up in their head
4. Kept bringing up drama and gossip and causing arguments with each other to the point where the whole chat goes to hell
5. Talking about personal problems like 100% in detail like medications, family issues, etc - stuff you wouldn't tell complete strangers on the internet.
So I don't bother with stuff like that anymore thankfully.
I am in a few discord groups but I don't bother logging into discord cause I rather use my little free time doing something more productive.
I am in a WhatsApp group mainly cause of my cousins (hometown group or something) but I have it on silent and mainly lurk.
Edit : quitting sugary foods, fast food, coffee , etc was easy though