To me the nicotine is calming. After a stressful day I will often drip some 12 to relax. I want that slight head buzz dripping some 12 gives me. As far as addictions go it sounds like you have traded one for another. A similar harm reduction switch us smokers makers. I want something that changes the way I feel, instead of tobacco, it is now vaping.
Bottom line is if it is helping you not overeat, vape what you want. Is nicotine in vaping addictive? probably. I don't think we are the best group to ask on this one. Many of us smoked despite the fact that it is bad for us. 4 out of 5 doctors have not recommended Camels in my lifetime.