Question 1: No, not really. There has always been a short time that I bit my lips subcontiously.
Question 2: I think my EC started (5-6 years ago) in a stressful period, when due to lip licking (I think) my lips became very dry. A crack appeared in my lower lip, which I started biting for about a week, untill it sometimes bled. Retarded as I was, I only realised that I should stop doing that after about 2-3 weeks. I kept licking it alot subcontiously for a long time, maybe 6 months, untill I found out that I had some chronic condition. By then, my lower lip was severely inflamed, painful, very swollen, peeling like mad. It hurt for me to talk, laugh, and sometimes eat. During this whole time, I ate quite unhealthy, low amounts of veggies, but I didn't smoke. I did, however, drink acidics like beer and cola.
I don't think I can say that I have a condition different from EC, because the characteristic skin peeling is still present. On the other hand, my current approach may not be advisable to everyone (!), because I don't have inflamed skin anymore. I will upload a pic soon.