 The internet. Sad state of affairs, but it's less of an "addiction" and more of a "reliance". At some point, things just get so bad that without it, it'd literally be a catastrophe. It's one of the few things that makes me even remotely happy any more (to the point that my ever-loving family is now pointing out the rare times I smile. Thanks, asshats.)
Aside from that, soda in general. I cannot fucking stand going more than a day without a can of something, and I will often have more than 5 a day if I can. Unhealthy as fuck, but given that I rarely eat throughout the day and don't drink water, well...
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