Nicotine (in the form of e-cigs) and the internet. I've never tried to quit either one. I quit smoking in favor of the PVs (e-cigs) and have no desire to get off of those. Not sure if it's bad for me or not but it's got to be better than smoking I figure. I could probably do with less time online but it gives me an escape from real life.

I've been addicted to other things before and quit or at least reduced consumption to where they were no longer addictions.