I relate to several on your list.
Since starting paleo and getting off sugar and caffeine the nail biting has dramatically decreased, though I'm not used to my nails being longer yet. They seem much healthier, though.
I haven't owned a TV in years so no issue there, but I've definitely taken the computer usage way down. I deleted Facebook and Twitter and cleaned up my email inboxes (including taking the time to unsubscribe from all the spam I've become a target for over the years), and I've been getting outside in the fresh air much more in the past few months. I prefer spending time with people in person rather than staring at "status updates".
I also read the book "The Shallows: What The Internet Is Doing To Our Brains" by Nicholas Carr, which is an expansion of his article Is Google Making Us Stupid?. Interesting stuff. I try to avoid being "plugged in" as much these days. No smartphone or tablet for me.
What's wrong with touching your face or eating hot food?